There is a rule in the PHB that says that if you use your standard action to cast a range:touch spell, you can take your movement between the casting and touching. So, if you start outside of a threatened region, you can cast a Cure spell, move up to an ally, and then deliver the touch (even if you are now in a threatened space). That doesn't help on subseuqent rounds, because you're now in melee, but it does come in handy.