But first some satire.
I feel that with the mechanics involved that the op nature of allowing someone to bomb someone without being in the room with them is too much of a risk of denying the responders any potential response, and I'll proceed to demonstrate this with a list of fire department response times from real life engagements...
But no seriously a good idea, more love for Riggers. Maybe allow you to track the rigger with the remains if they fail a skill roll, with a forensics check on the drone. Something like that.
Except in this case, someone with explosives rigs an ethicol timebomb to them. Remote detonation seems too OP'd to me, personally. I think you'd have to dial in the time in advance, the way it currently works, and people in the room would still hear the beep of the countdown at thirty second intervals even if the drone itself is hidden.
Still powerful, but you'd have to crash a party with it rather than wait for someone to be walking by, for instance. It just seems too strong otherwise, unless it's only frag grenade force or something.