You could make them throwable, but then whats the difference between bombs and grenades? Make then placed and detonated by the player, and you're getting pretty close to what mines can do. And its a damn shame it looks so unwieldy because some of the effects are pretty cool. Fire bomb (burn), Concussion Bomb (inflict Daze), Smoke Bomb (blind), Glue bomb (immobilize).
But compared to the Grenade kit, if i can be honest, its not that great. With grenades i can also blind only at range and with a much shorter cooldown.
Grenades can be used to inflict Bleed or Poison. Both being better then Burning, especially poison as it reduces healing by 33% aswell. Again, shorter cooldown.
Instead of rooting someone with the glue bomb you can Chill them and reduces speed by 66%, aswell as recharge in skill cooldown by 66%. IMO a superior effect to just rooting for a few seconds. And again with a much lower cooldown for grenades.
The only thing bombs got that a grenade doesnt is the Daze. Maybe bombs are dealing a ton more damage to make up for their lenghty cooldowns and difficult to use nature. But in all fairness, utility slots are limited and if i was faced with a picking an explosives kit id go Grenades first, no question. And if i could choose a second, im even thinking Mines over Bomb because they just seem awesome for controling an area.
Just speculating ofcourse.