Time magic easily could extend to time and space magic. They could implement an enhanced healing over time spell that could be more reliable than regen. I'd personally like to see them give us Frog, Mini and Confuse. I always thought that having sleep be the only kind of mass crowd control was boring. I was happy when they gave us Break and I'm eagerly awaiting Breakga. There's a gradual petrify move already in the game done by Kukulkan and Doom would probably throw off the game balance somehow, but would be cool to see. Higher tiers of haste would be kinda cool too as would Stop, if it was some kind of long duration terror.

Having a HoT healer would ensure that a time mage could never take over the role of a WHM as a main heal. A small amount direct damage spells would ensure that it could never take a RDMs place in terms of full versatility even if its enfeebling skill was on par with RDM.