I am a campaign fanatic and have been thinking of things I'd like to see included in Campaign to make it more enjoyable.
1. Auto-reraise. I don't care if it's an item we buy with Allied Notes at the Sigil guy, a sigil buff with the Medal of Altana for 10,000+ AN, or is only activated when campaign is ended in the zone and we had campaign tags up. I just want some way to have auto-reraise at all times during campaign, because I can't count the number of times I was the only person at the battle. It's irritating running back to Jeuno for new scrolls of instant reraise, and I'm not subbing white mage because it's so inferior to red mage sub now. And, I'm not spending money on reraise items because campaign is for pure entertainment, and it's not worth dumping a shit ton of gil into -- most of the time my reraise wears without using it, and then the ONE time I do need it it wears off right before I eat the dirt.
2. Make our medals mean something. We have 20 total medals, each taking 5 days minimum to acquire. That's a minimum of 100 days to reach the best medal. I feel that after all the work of obtaining the medals, we should have
something useful to do with them. I know there used to be certain campaign OPs, a couple of decent armors and the EXP ring from conquering the northlands, but let's be honest, those are no longer as important as they once were.
We could either gain more buffs, better buffs, or something special when in campaign with a Medal of Altana shining brightly on our chest. I'd personally like to see the ability to control an army, since, we are the highest rank we can be at that point. I'd like to tell NPCs to get the hell back and let me pull a foe to them, rather than them charging in and feeling defeated after their foolish attempts. We could either control a specific army (and only when they're at the zone with us), or the ability to control one army at a time, whatever army is present at the battlefield. Again I don't care if this has a restraint on time (such as once per Vana'diel day) just as long as it's not ridiculous (like once per Campaign tally).
3. I'd like to see more Campaign: enhancement gear. Things that are amazing in campaign and poop outside of it. Maybe some equality pieces, like Strength+50 for all jobs! And it'd be really fun to magianize these; Start out with a base piece with poop stats, and after a certain amount of magian trials, the armor can have whatever buff path you chose. The magian trials can be slay a certain amount of beastmen type under offensive/defensive, or maybe join a certain amount of campaigns, or successfully complete x amount of campaign ops.
4. I really like Urthdigger's idea for the fortifications. If we can't have monsters coming out of the fortifications, then perhaps we can have some way to actually take down fortifications? It's so boring sitting there whacking on a wall for two hours only to accomplish 200 xp. It's not fun and in the end it doesn't do our nation any good. I propose we either see Urthdigger's idea, or maybe some sort of bomb system where we can run around and blow things up. More interaction please.
5. Stop making our NPCs such cowards.

I go into battle single handedly, kill a couple of orcs, they decide to come help me, and then on the third orc, despite me being able to
solo them, they get scared and run away! Their defeat destroys Sandy's power over the zone I was working hard to preserve. Jerks.
6. Skill ups would be nice, but since the monsters are low level I can see why it's not included. I mostly want the place to be interactive and fun, with a sense of accomplishment. I want to feel with each medal I gain a little more power or a little more control, and with better armor I can become the true San d'Orian general that the past is so desperately in need for!