Suggestion: unlimit the cross class system.

[Shadex]

The limitations come from a concept of specialization. When you become a warrior or a paladin you no longer practice the same skills you did when you were a generic arena fighter. You have to spend more time learning and mastering the new skills that are particular to your new field. That is why we do not have access to everything anymore. Think of the old concept of "Jack of all trades, master of none." You basically want a master of all trades idea here and while I understand you want to limit the skills to only those in your cross classes it still it just too much. The entire idea of specializing goes completely out the window.

I realize we all want to be all powerful super uber god characters but truth be told, being truly a hero and worthy of any kind of recognition comes more from using what you have and figuring out ways to conquer even with limitations. That is why I never liked Superman, yay... immortal super hero... how heroic is it to run into a burning building when you are impervious to anything? Work within your limitations, master them, overcome them. That is the idea of challenge, not being able to do everything.

[kyuven]

This would be pointless for many classes, though, such as MNK. All it would do is give a couple extra defensive cooldowns for some classes.
Most classes only have 4 that are useful anyway.

For SMN this is completely useless since they only get 6 crossclass skills anyway, and one of those is freakin' *hawk's eye,* even quelling strikes is of questionable value to SMN since they don't even do as much spike damage as BARDS, being a full on DoT class. They also get Blizzard 2 which is of situational worth. you're usually better off using Miasma 2 since it's affected by contagion, but it's an option.
Black Mage has the same ARC cross class skills as SMN, with quelling strikes being valuable to them. Their ACN crossclass skills though...Eye for an Eye and Virus have value, and Physick when soloing COULD have value (but not much), but Ruin is just worthless. So worthless I question why it's there in the first place. Ruin II would at least make sense but Ruin?
Right now, BRD and NIN have 9 abilities with 5 of them being of real value. Featherfoot and keen flurry are near useless outside cross-your-fingers-and-pray solo situations, while haymaker and feint are just plain laughable. If they weren't GCD skills, I could see them having some value, but as they are right now, using them means wasting a heavy shot, straight shot, or DoT for a slow with diminishing returns.
DRG has the same issue as BRD, though an extra slot would give them access to Foresight AND Mantra, rather than having to choose. So there's ONE class that would get a concrete benefit +1
MNK pretty much struggles to find abilities to fit their 5th slot similar to BLM and SMN. Feint and Keen Flurry I mentioned before, with Skull Sunder only being useful for pulling aggro (and even then you're seriously better off using your combos) and Fracture is just a weaker version of a DoT the MNK (and DRG) already have, with the added problem of taking away from their set rotations.
SCH's choices are kinda...eclectic. WTF was the point of giving them RAISE and CURE as crossclass skills? Other than that, they have 5 worthwhile abilities with the rest either being trash, a joke, or just not worth it.
WAR (and PLD, technically) would somewhat benefit from lifting the restriction, as they'd get more defensive cooldowns...of questionable value, but meh. So +1 for each. +2
WHM has the same zaniness of SCH and BLM: What's the point of getting access to Physick and Ruin? And from THM, they get Surecast and Blizzard 2. I don't think I need to tell you how silly Blizzard 2 is for WHM, unless you're level sync'd below 45.

So yeah, that's three classes out of 10 that would actually benefit from "unlocking" crossclass abilities. This restriction is mostly in place for Classes, and for Jobs there just isn't much reason for it.
So yeah, unless they add more crossclass abilities for everyone when they add Astrologian, Machinist, and Dark Knight, I simply don't see the benefit in expending effort to change the system. It's like a store limiting two barbecues per customer, with the realization that only people with pick-up trucks or vans (WAR, PLD, and DRG) are restricted by the rule.

[Skeith-Adeline]

I re-read the comment I was arguing. We both were misunderstanding each other. I took it as you saying the BLM wouldn't be able to use flare. When I posted the comment, the OP was different. I didn't know the OP was changed until the comment after mine.

[DracotheDragon]

i am on 44 hours awake so i will say this simple because i may fall asleep while typing this or i am so tired i won't make much sense

if everyone had the ability to use any skill they wanted, every troll would use provoke and tanking would be impossible, everything would use manthra making healing so easy thatt hard things don't be come a challenge, they did it to add challenge to your team as well as, some aim of adapting with your class. and also to stop people from min/maxing the class and being extreme elitist.

[Chiramu]

stoneskin invigorate and blood for blood on warrior

Rampart would be nice to have for WAR.

[Lynny]

It would be cool but i think it keeps it limited simply because you have special skills from your job. it would make things a bit easier too. it's to make classes dependent on each other late game mostly.

[Cabalabob]

i am on 44 hours awake so i will say this simple because i may fall asleep while typing this or i am so tired i won't make much sense

if everyone had the ability to use any skill they wanted, every troll would use provoke and tanking would be impossible, everything would use manthra making healing so easy thatt hard things don't be come a challenge, they did it to add challenge to your team as well as, some aim of adapting with your class. and also to stop people from min/maxing the class and being extreme elitist.

Rampart would be nice to have for WAR.

It would be cool but i think it keeps it limited simply because you have special skills from your job. it would make things a bit easier too. it's to make classes dependent on each other late game mostly.

Ok are people literally just reading the title now and not a single word in the thread?

THIS SUGGESTION DOES NOT GIVE ACCESS TO ANYTHING WE DO NOT ALREADY HAVE ACCESS TO AS THE GAME IS NOW.
The only thing that would change would be instead of having those 10/5 boxes which you have to fill with abilities is that all the abilities you have access to will be ticked with the yellow box. You would not have to pick 5 or 10 of them.

[Lynny]

ah i see. my mistake.

[Coldheart]

I'm my humble opinion the best idea is to use a "skill point allocation" for cross-class skills, like PVP.

You gain 1 point for each level. Each cross-skill cost "x" points and you can buy traits for each skill (short recast time, enhanced duration, etc).