Instead of reengineering existing weapons to satisfy our cravings for new strategies, why not actually create a new weapon?
I remember when nexuiz 1.0 came out, there was a promise that the then-current implementation of nexuiz was but a sample of the game's power, that its true power was in the number of mods that it would spin off, and that this was especially true of the weapon system. Yet in the entire history of the game's existence, no one has added a single new weapon.
So I humbly suggest that somebody more skilled than I actually create a new weapon using existing, past, or unused models. You can be as creative or mundane as you like - if you just want to make something that you shoot to do straightforward damage, go for it. If you want something that has strange side-effects and combos like the electro, that'd be great too. If you want to steal from existing work, well that's why this project is open-source, isn't it? Why doesn't someone turn the grappling hook into a weapon item instead of an innate ability - sort of like the way the laser is not "built-in" to the character but supplied as an external tool? That way access to it could be controlled a bit more (e.g., it doesn't have to be supplied by default but can be picked up on the map), and it might fix some of the current issues that IMHO cause it to break gameplay. Don't like that idea? Ok, remember that laser-guided rocket feature that nobody likes to enable because we're so dependent on our precious simple right-click-to-detonate button? Make a new weapon slot for it, change a model or two, and put it into the mainstream game. That mod added in a whole new concept yet it's totally wasted if we don't see it in normal deathmatch games.
So in summary: The current system works well. Rather than alter existing strategies and existing balances, why don't we try to augment them with new ones?