I want to suggest in Icecrown server specially that it could be very useful to be able to learn more than 2 talents. I know the game itself is designed this way but as this is a private server i imagine you might be able to change it. It could help lots of classes such as Shaman. If you want to play both pve and pvp you have enha, ele and resto which in total equals 6 specs and 6 different talent and glyphs. It would be nice if you could implement this future.
Unfortunately this would fall under custom content so we aren't interested at this time. I suggest checking out addons like Talented and ActionBarSaver to simplify switching between 3 or more specs.