Ah, interesting thread.

Vivi - Osmose
Zidane - Steal
Steal MP (Zidane gets his MP back instead of Vivi... not too useful I suppose)

Amarant - Revive
Eiko/Dagger - Life
Quina - Auto-Life
Rebirth - Auto-Life for all party... you know, all at once in a single turn. Yay!

Steiner and Beatrix with X-Strike during the Alexandria defense scene would be a nice touch, as well as being a charming nod to Chrono Trigger.

Zidane - Detect
Dagger - Scan
Third Eye - Same effect as Detect and Scan at the same time

Can't think of any more :P