Wrist Launcher, what is it good for?

By far the coolest thing to come out of ultimate intrigue, but it received zero support. Even UI had no options for the wrist Launcher besides "Look at this nifty weapon. Moving on."
And as far as I know, no other books have touched them. I'd love to be wrong about that.

So, title text.
Mei from Avatar comes to mind, but I think PF doesn't well support that style of character.

I'd say it's main use will be delivering poisons + sneak attack. A close range one off shot using the sniping rules.

say you're a typical half-orc rogue with a greataxe walking around, ho-hum, got my axe in my hand, one hand is wearing a cold iron spiked gauntlet, and the other is cloaked by a stupid-looking sleeve from a wizard's robe, ready for action.

Suddenly, a whatsit! appears. What do you do during the surprise round?

a) Partial charge the critter and sneak attack it: No! That's just what they want you to do! Never charge into melee by yourself on the first round of combat. Your AC is still terrible!
b) activate a spring-loaded wrist sheath from your robe hand to grab a dart and throw it at the whatsit: maybe. You get +Str to damage, but the range is only 20ft. If you're a charismatic type, you could also use the underhanded rogue talent at this point
c) fire a bolt from your wrist crossbow: yes! no +Str to damage, but the range is higher than a dart, so you'll hit more often. plus you can use underhanded if you've got it, and you can use funky bolts if needed.