Tranquil: Swiftcast has been a great asset. I've noticed it for doing rezzes, and also for just combating screwups in normal healing (I threw a rock... oh wait, I needed to heal!)
But why not cast Regen pre-emptively? Given the mana efficiency on it, I just tried to keep it up on all times on the tank, and during boss fights, additionally on any melee DPS... Pre-emptive casting means I can usually make use of non-combat mana regen as well. Given that I only -just- got Regen, I've not had a lot of experience with it - please expound!

Eltaire: You answered my question, but that's not helpful! I play on an (Alienware) laptop, the F-keys are 1/3rd smaller than the rest of the keys. It's actually a great keyboard for 90% of everything - I don't feel squished when I type for example - but the F-keys are the sacrifice. Well, perhaps I just need to train myself to use them... Or rebind the keys.