I've seen UV/IR sniper rifles in other games. It's a nice simple (for Trek anyway) solution to a weapon issue. At least until some engineer hotwires some kind of scattering field around HQ....
Just a thought: could the transporter/slug rifle transport rounds when a sensor jaming field is operating? Considering all the things we see that screw with sensors seem to take transporters offline, that was a thought that went through my head.
I've been thinking about unique sniper/stealth kill weapons. Ripping off the "smart bullets" from the movie Runaway, one could imagine a "micro-missle": a bullet/missle the size of one of those 50 caliber rifle shells, but able to track a target and follow them. Actually, I've heard some kind of smart bullet was in early RD in the real world, so when you add the Trek Tech to it (sensors, better propulsion, maybe a tiny little antimatter warhead?), you get a really nasty weapon. Heck, they could even get worse, if you make them little sensor probes, like the ones that hunted the Bak'u in Insurrection: give them some a little AI, cloaking, holographic or blending tech, a nice antimatter charge and a list of targets, and you get tiny little suicide bombers, all quietly floating around the warzone, looking for targets to get next to and blow up!
But I'm just snowballin here...
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"Yes, it's the Apocalypse alright. I always thought I'd have a hand in it"
Professor Farnsworth