Well, I've never really had that problem before o-o;
In fact, instead of other cocky people taking over, I'm the only one shouting for highest def and stuff in KQs, because nobody else tries to talk ^^; Fortunately, Robo KQ demands higher cooperation and more people need to work together to solve something ...
And as for life tap, I see no problem in it as long as the cleric isn't busy. Because it probably is quite useful, as tool said, for evening out the HP/SP bars.
My pet peeve is when people same in KQ >O< I've seen a lot of that in Robo lately ... stuff like "i need party plz" for over 10 times and crowding out the chatbox is really annoying.