Quote Originally Posted by Easy_Lee View Post
Well, being able to use just one is very convenient if you find a magical crossbow.
Yes, but magic items are not assumed to be part of the game, and most don't play at a level they are really needed.

Which you could just make a pair of hand crossbows that each have the same properties and one only works if the other is being wielded too.

Give some fluff about them being a older sister/younger brother pair of weapons? *shrug*