At least regarding Enhancements there should be the possibility to save and switch between two selected Enhancement setups. Many classes have the possibility to build a toon rather this or that way, even if built for a specific role and related feats are chosen. Off-Tanks, Off-Healers, Off-Range dps are still possible for Main-Dps, Main-Caster-Dps, Main-Melee-dps (depending on available classes/trees). A Wizard could change between PM or AM, between Spell Focus on this or that School, and so on. A melee Druid should be able to switch to emergency Caster/Healer.
Please make Enhancements Dual Spec available.