I've got a couple of ideas for crossbow users. In regards to the
"shoot first, then grab a real weapon" perhaps some skill that works
similarly to gloveknock for sabres where the crossbowman can shoot
an arrow, then automatically drop the crossbow and wield a weapon.
Perhaps requiring a special swordbelt that could hold the (shortblade
only most likely as its the only other weapon skill archers get)
weapon in a scabbard, and have hooks to hold the crossbow
when not in use or swapped out.

Since crossbows already don't require as much hop back as longbows
or shortbows, that helps somewhat with less experienced archers, so
perhaps crossbows could get a bonus to not having aiming interrupted
in combat, or be able to buy some iron sights for your crossbow to
allow aiming benefits to ramp up more quickly.

Finally, to help with rapid winching costs, perhaps a repeating
crossbow that can shoot faster as long as its magazine is filled, but
requires longer time to refill the magazine from your quiver/inventory.

Just a few things that came to mind.

--Hair