Another bad idea from the bad idea machine, but...
I think it would be interesting if gold players could purchase extra powers. The game's pretty much balanced that players can only use one form/active defense/slotted passive at a time, so I don't think it would be too game-breaking. If anything it would allow players to use different power-sets in different builds. At the very least it would be nice to use an extra travel power.
At the very least a device that could be set to any travel power you've unlocked would be cool.
Okay, back to playing now.