Maybe it’s an ability that if you have a grenade in hand and touch an enemy you slip it into his pocket then go mail his mummy the pin. 
Explosive weapon question
Then there’s shooting your own nade (to make it blow up where you want it I guess).
IIRC, in HORSE’s Compen-wossname, it mentions sticky grenades for the Operative.
Heh, playing a light operative with sticky grenades and perks that give extra grenades and enhance this function would be hilarious. Just run around until you find a group of enemies, knock 'em down and plant sticky bombs that only enemy operatives can see and disarm, Lather, rinse, repeat.
Yeah, but they take time to respawn. i was hoping to be able to carry two at a time, for this example. Or decrease the respawn timer.
Those would probably be Soldier abilities if they exist at all. But yeah, Operatives get the sticky bombs from what I remember. Still can’t find where I heard that though. But I remember reading that if you get stuck you have like 10 seconds to get a teammate to pull it off of you before it goes kaboom and you die or get incapacitated. Might have been only Engineers that can pull it off…
EDIT: Just wondering, what sort of weapon attachments do you think the grenade launchers will get?
Different grenade types are on different cooldown timers. A Soldier using a Molotov and a Frag grenade back to back is pretty darn powerful, it just takes two Supply pips to do so.