I am suddenly reminded of the double-barreled cannon from the civil war. Except instead of bolas, you had a pair of cannonballs with a heavy iron chain linking them.
Chainshot, it was used in navies the world over long before the US Civil War.
I see the Bolas Launders being similar to a crossbow, drawn very tightly then snapped forward launching the two spheres at the target. It's great as a capture/incapacitation device for non-lethal captures. Like bounty hunting. Get 'em wrapped around the legs as they're running and laugh as they faceplant.
Yes, I know that makes them look like a Bowcaster from Star Wars, you got a problem with Chewie?