itp_merchandise - Means it can be found in stores.
itp_primary - I don't actually know what this does.
itp_two_handed - Means you can't use a shield with it.
itp_cant_use_on_horseback - Means you can only us it on foot.
itcf_shoot_crossbow - Means it's animation will be that of a crossbow firing.
itcf_carry_crossbow_back, - About the way it's carried when you're not using it. Attached to your back, in this case.
182 , - Usually the weapon length, but that doesn't seem to count for ranged weapons. 182 is no where near its actual size.
weight(3) - Obvious, the weight.

difficulty(

- Eight strength needed to use it. If it was a boy it'd need eight power draw instead, I think.
spd_rtng(43) - I'm not sure. How fast it reloads is my guess.
shoot_speed(6

- How fast the bolts fly, I think.
thrust_damage(46,pierce) - How much damage ammo does.
max_ammo(5), - Means this particular crossbow can shoot five times before needing reloading.
imodbits_crossbow - Means it'll only get the imods crossbows get, so it won't be battered like a shield or champion like a horse. (

)