Here's a little trick I have found. Since one of the patches recently you're allowed to cast certain spells while on a mount. Well cool thing is if you are on your mount standing still, you can cast a spell then start moving while your spell continues to cast. Problem is you have to stand still to recast a spell. This is fun to do though as a ToS because I can kite people by casting Lightning Strike, run toward them, stop, repeat. It can be helpful with longer casting spells such as buffs or even resting for more stamina.