Bubble-Bomb: Basically a small stationary shield to give some safety from ranged attacks for fireteams to engage from, or safely heal & prep potions, or recover their shield. The shield would absorb a limited amount of damage and have a timer. (flashing before shutting off) To make things interesting, avoid abuses, perhaps design it so that shields cannot overlap or layer. if placed too close to a deployed shield, it will collapse. A new shield can be readied, but only deployed once the original shield falls. (or in a new location outside the existing shield.) Players are not protected from mobs that are inside the shield. (ranged attack or otherwise)

Basic attack: Small shield that stays active for approximately 5-6 seconds. (Enough time to charge a bomb, give or take)
Charge attack: Deploys a slightly larger shield for up to 15 seconds or so.

Upgrades increase the strength/duration of the shield. (maybe slightly increase size)

Purpose: Gives bombers a utility bomb for fortifying a position temporarily, providing a short respite from gun-puppy/polyp cross-fire. This allows level designs to increase in difficulty for teams where utility bombers become significantly more important to have along.

Heart Bomb: (Love Bomb) A place-able health station that can slowly recharge health over time. As a quick drop it would recharge anyone standing in its small radius a 1-time 1/2 tick amount. The charge attack would set up a health recharge with a small radius where characters standing in the radius would be healed slowly. Poisoned characters that wander into the radius would take damage. Does not affect mobs.

Basic attack: Sets of a small healing charge for 1/2 a tick. Increase radius and health amount with upgrades.
Charge attack: (long charge, slow movement) Sets up a healing station with a small-med radius. Recharges health until expires. (or limit to total health) Increases radius, recharge rate, (and total health limit)

Purpose: A utility bomb for extended outings. Might be a high price to carry in a slot but can help keep a team alive in Arena-type levels. Allows new level types that perhaps have no/far fewer health drops.