If the mage's void summon kills a holiday event monster, the kill is not counted towards the 5000 kill achievement. Sound like a bug to me that if your summon gets the final hit in, you get jibbed.
As it stands now, if your respec is cooling down it shoots to the top of your shop cooldown list above where summon group sits. If you are like most people these days and use group summon 5+ times a day you run the risk of accidentaly buying the respec cooldown (up to 250ep). I did this lol by accident.
I suggest a confirmation to buy it, such as a simple yes/no option. That way if your an unsuspecting drunkard like me you don't buy it by accident.