A fun feature could be being able to create custom macros that combine a single power with an emote or action. For example, if you have a boss on the last sliver of life you could have a finishing blow type power macrod to chain into a dance. Or you could be in street clothes and when you activate your opener it changes you into your super suit.

This would likely need to be balanced to where two or more powers couldn't be chained in the same macro to prevent botting (or macros chaining into macros).

I agree. For RP-purposes this would be awesome. But I think this also would playing into the hands of the multiboxers somehow.

I think restricting the macro usage to binding emotes would be a good compromise. No making the game play itself for you but RP emotes yes.