In 3rd edition there was a rule where for every 4 levels of experience you could raise one stat by one point, will that apply in icewind dale 2 too? and something I have already asked I think but I don't remember if anyone answered it so here it goes again, will two handed weapons inflict one and a half the strenth modifier ?

buh buh

Currently (and it is confirmed by designers) every four levels character receives a point to place in the stat of your choice in IWD2.

I'm not sure about modifier for two handed weapons' damage.

Dont qoute me on it or anything, but I believe I read somewhere, that the Str bonus is in, though I cant for the life of me recall where I read it.

Look to Extremist to know before jsut about everyone ;)

Found it! J.E. Sawyer posted it while explaining why two-handed weapon could be more desirable option for a NPC with nifty STR than dual-wielding.

Yes, it's in. ;)