MindxKiller
Explorer
There's no good reason to not allow weapon + handbow (or dual handbow). Your doing the same damage either way (1d6+dex), and you look cool doing it.
Just don't allow shield + handbow.
That's only true if the weapon uses a d6 die, the rapier is d8 so it doesn't fit. Though I play in a game where I use a shortsword and hand crossbow and the DM doesn't mind since it's the exact same as using just a hand crossbow by itself except I put myself in melee for flavor.