So i had an idea, have an explosives weapons menu, with the grenades, and:
C4: 4 pieces, does grenade damage. left click to place a piece (sticks to blocks), right click to detonate. to defuse, destroy the block it's stuck on.
Grenade launcher: 2 shots, 50% stronger than grenade, 50% larger blast radius. longer range, detonates on impact.
Rocket launcher: 1 shot, 100% stronger than grenade, 100% larger blast radius. even LONGER range, detonates on impact.