Out of all the ideas in this thread I like the one about EMPs disabling the Radar portion of the HUD for a short time and perhaps disabling small base defenses like guard towers, turrets, or sam sites (but NOT AGT or Obby) for a short time as well.
Another idea that I haven't seen mentioned yet would be to delay an Ion/Nuke beacon, throw it at a beacon and have it delay the timer for about 7 seconds (give or take but less than 10) perhaps? This could be a thing as people already complain a bit that there is "not enough time" to disarm beacons. Having an extra 5 or so seconds to disarm before it gets to "initiated" could be interesting.