Hi Kim – thanks!
Actually I have had my own ideas on exactly that since the first Animation Paper ideas popped up. I mean the ability to keep a palette and change colors after they have been used in frames, so you can do things like adjusting colors instantly and globally after a scene have been fully painted, etc. I later found out Toonz have somewhat similar features as what I dreamed of 🙂 Anyway, this is planned and will be part of the coming alpha releases.
Cheers,
Niels