[Vassago]

Ok, I had my Fighter/Theif halfling be proficient in missle weapons b/c I read somewhere that they get a bouns to missle weapons. However, I am considering switching him over to crossbows so that each of my 3 characters would be using different ranged weapons. My question is how much of a bonus does my halfling get for using missle weapons? Also, I know that theives are not supposed to use crossbows, but since mine is multied w/ a fighter, is there any penalities for having him use the crossbow?

Thanks,
Vassago