Timed bomb sucks, just remove it.
Proximity mines should deal higher damage, so that you think twice befor walking near one.
P4 should have a shorter cool down and stack damage, as well as be invunerable to other players bullets (but not melees
)
Buff the damage of barrels and make it so they don't explode when thrown unless of course they hit a player
Buff bear traps so the whole animation has to play instead of players being able to interupt it for a shorter period of immobility
Buff the hitbox of boxes and significantly increase their health
Make caltrops slow players down in addition to damaging them
Buff the satchel charges to have a much larger and consistant area of effect as well as a shorter timer and a huge damage buff