Crossbow Scatter-Shot Ammo: Splinter Box

[Warclam]

I like the rules for firearms scatter weapons, and was considering a way to apply it crossbows. I'm not sure whether it would be for any crossbow or for repeating crossbows only (taking the place of a magazine), but here's what I came up with:

Splinter Box
A splinter box attaches to the top of a crossbow, and resembles a magazine for a repeating crossbow. However, it doesn't feed bolts into the crossbow's string. Instead, a plate is set up so the string pushes it, and the plate forces all the bolts inside the splinter box out the front of the box itself. This makes precise aim impossible, but allows multiple targets to be hit in one shot.
Treat an attack with a splinter box as a scatter shot, as per the firearm rules in Ultimate Combat (15' cone, attack roll for all targets at -2). A splinter box costs and weighs as much as a full case of crossbow bolts.

Thoughts?

[Kilrex]

Why stop there since we are getting silly?

Double Bolt Light Repeating Crossbow: This repeating crossbow would have 2 bolt grooves and 2 bolt cases mounted, so it can fire 2 bolts simultaneoulsy. Just add +2 lbs and 50 gp.

Belt Fed Heavy Repeating Crossbow This heavy crossbow has been modified to remove the bolt case and uses a feed tray to load a belt of bolts. Just add +1 lbs and 100 gp. A belt of 50 bolts would be 10gp and weigh 9 lbs.

Shoulder Mounted Crossbow This crossbow is connected to a torso harness to help distribute the weight and rests above your shoulder. A crank is mounted under the stock so the crossbow does not need to be disconnected from the harness to reload. The bolt is a shortspear with fletching added. Bolts come in a leather quiver that can hold 5 bolts and costs 6 gp.

Two hands are required to fire this crossbow. Loading takes 2 full-round actions. If another creature asssits, the reload time is reduced to 1 full-round action. Repid Reload reduces the time to reload by yourself to a full-round action or a move action with assistance.
Cost: 600 gp
Dmg (S): 1d10
Dmg (M): 1d12
Critical: 19-20/x2
Range: 60 ft.
Weight: 12 lbs.
Type: P

[Warclam]

I love these, they're totally brilliant. A few notes about them:

The DBLRC seems under-weighted to me. A double crossbow weighs 18 lb. This beasty should weigh at least that much, probably more like 20. Price is fuzzy, but I'd probably call it 400 to match the heavy repeater.

I totally love the BFHRC. I'm going to ask my DM if I can use one. I'm going to be told no, but it's worth asking anyway.

The SMC seemed underpowered for how much hassle it is to use. I'd probably give it the stats of a 3.5 great crossbow from Races of Stone (2d6/2d8 damage, 18-20/x2 crit). That's a weapon worth strapping on if you want ludicrous amounts of crossbowitude. It's strange how light it is, but I'm guessing that's to reflect the effect of the harness?

Regarding the OP, OK I guess it's rather silly. Do you have a more sensible idea for a scatter-shot crossbow? Dragon magazine had a splintering bolt which you just crammed into the groove and which broke apart on its own when fired, but that seems a bit off.