The combat pools are not the reason they are going against open combat, they just get too creative with what to do and decide to do random fun rather than fight.
9 sessions in still combat shy. =) We will see what happens during tonight's session. I have 3 combat scenarios that COULD happen, but I won't force any of them unless the story requires it.
Sounds like you have an excellent group. When combat does occur, I bet it will make you squeal.