Tactical retreat and adrenaline on all characters ftw.
TR is a combined escape/teleport that includes haste for 1AP. Using adrenaline is +2AP|-2AP but if you use adrenaline and spend one of those ap for tac (or alternatively just regular haste) it becomes 1x free positioning +1AP|-1AP|+1AP total for the next 3 rounds. Since escape/mobility skills are mandatory anyway I always felt like tactical retreat was the best thing ever for the "free" haste. For summoners you get adrenaline "for free" because you pop incarnate + adrenaline + buffs on the incarnate, then you only have 2AP on the next turn - but the 2nd turn for a summoner is a pretty "dead turn" anyway, so you get to cast 2x1AP support spells.
Elven racial ftw as well.
