It seems strange that the only limitation on Improved Bow Construction is "cannot be used on firearms". Is this trait intended to work with thrown weapons and heavy military weapons?
Also, for the purpose of applying Advanced traits do you pick the weapon and modifier when you take the trait or can you mix and match when you're selecting gear during roster design? For example, when I pick "Improved Bow Construction" would I need to specify, "only on longbows, only for +1 ranged" or could I apply it generally and use it if the unit take longbows, recurve bows, sometimes for a +1 to hit or other times for an increase in range?