If it's a question of always having access to class abilities... the answer is menus.

If it's an issue of not wanting specific abilities on my action bar because of personal preference the answer again is menus.

The notion of FFXI with it's abilities that you can't choose or dictate is a poor one... because almost everyone ended up using macros, and they could choose what abilities they macrod in and where they were placed... completely customizable. Thieves weren't forced to have steal and mug macros that if they didn't want to use were placed in some out of reach area. Mages weren't forced to have a macro for every spell they knew.

I will point out that Doctor Mog's complaint seems to stem from some pretty severe OCD and SE really shouldn't be forced to accomodate that... but at the same time, the action bar in it's current form is a horrible mechanic and needs to be altered.