"Laser sight!" (a +X bonus to hit for ranged blaster)
"Pentium-8 with AI!!!" (as the
seeking property)
"Napalm-Coated Projectiles" (as the
flaming property, and it damn well takes a standard action to light the nozzle, just like it did for Ripley)
"I call it a Loudener" (+2 points for obscure 80's reference) (as the
thundering ability, plus it's really loud)
For melee weapons, adding
shock should be easy to hand wave, and you can just say that
flaming is pronounced "plasma" or "napalm-feed".
Mighty cleaving is just another word for "monofibre vibesaw".
For higher plusses to missile weapons, consider "head-mounted integrated HUD sight" -- with better & better targeting, or quicker targeting (for the
speed enhancement), or whatever.
Bane... hmm... "Pentium-8 with a really spiteful AI!"
-- N