Another question does having more points into a weapon skill make it more accurate and do more damage, or just more damage?
I think it affects accuracy too, since the weapons have the skillrequirements (and I seem to recall it being hinted at that too low skill - in addition to the str req - will mean less accuracy).
And I wouldn't go as far as thinking that every weapon keeps getting better and better all the way up to the skill of 100. In fact, I suspect, that the skill requirement is - if not the roof of the proficiencylevel - at least very close to it. So that a weapon with skill req of 25, will stop getting better at that point or little past (would make sense, since some weapons have a skill req of 100). But that's just a guess.