Aim...?
 

Instead of leveling up in the physical category to improve your aim with missle weapons, what if you had an aim category? it could go up points with each sucessfull hit...even though bows arent out yet..

And I entirely doubt that bows will be the only projectile weapon, i can see players having slings (david and goliath, NOT bart simpson) and picking up rocks and throwing them,possibly even crossbows. Cannons could also deal with the aim idea....

Theres a cannon in bomboria already :D