I'm not actually sure this is in the spirit of this particular mod, but I was thinking of making a little remote control airplane that you need to recharge with batteries. It would be sooooooo much fun. Maybe also a remote control car.....
I'm also wondering about larger scale on that but I think it's a job for Flan's planes mod since I was thinking more........Predator Drone esque but starting small is best.
Also futuristic weapons and gadgets (I'm sure this has been suggested a LOT).
TO SUM IT UP, I'M SUGGESTING ON THESE LINES:
Remote control:
Planes
Cars
Boats
(some hybrid of all 3?)
Weapons:
Taser (handheld lightning-ish)
Heat Beam (cause a magnifying glass and the sun just don't do it for you)
Zoom-able nightvision goggles
Water Compressor Gun(Ratchet and Clank style)
Laser Hookshot (like a laser anchor on anything, it can be shortened, lengthened and maybe even swing.)
4+ Digital Padlock for doors (it seems more cool than practical, but multiplayer effective)
Etc.... Feedback? 
