No, the button (F12 on the keyboard when the NPC's portrait is selected) is for innate abilites. Imoen has a minor sequencer and a spell sequencer prepared, and the icons show up there as they should.
Anyway I did as Kezardin suggested - killed her then resurrected her. Now the buttons work fine, the romance is still active, and my reputation is still intact (as witnessed by Sarevok's *constant* grumbling)...
