I don't know if there already has been a suggestion like this, because I was too lazy to browse all the pages... anyway, here it is:
I think a crossbow the size of let's say a pistol  would be a great addition to the game. The Pistol animations from F&S could be implemented when holding the gun and reloading might work too. 
A downsized Light crossbow model could also be used.
It should take up 1 slot and have reload time faster than the hunting crossbow, but do less damage.
Just a thought I had... 
Let's hear what you guys think.