Idea: Rebuff Addon

[Naifu]

Not wanted by Trion and not possible in combat. Outside of combat you could do something like you described. However as soon as combat starts you'd not be able to change the order / visibility of the buttons.

This is a limitation which affects any potential dynamic action bar addon and has been discussed in the official forums. Don't expect something in that direction anytime in the near future.

Cheers
N.