Dragon 349 has a bunch of speciality bow and crossbow equipment. For example, you can make you crossbows Steel so you can use it as a bludgeoning melee weapon; PLUS you get to enchant the melee portion seperately, which is good for stuff like adding WSAs like Eager. You may also be able to add extra weapon crystals and wand-chamber to the melee portion.

Tanglefoot bolts from that issue are exactly what you think and seem to fit with what you're going for.

That issue also has Splinter Bolts, which are borderline broken. They turn your shots into 30 ft cones with no attack roll but Reflex for half-damage, which can mean a lot of multi-target damage when comboed with damage boosters, plus they're great for when you're at your last re-interative and probably couldn't hit otherwise.