there is no way to stop explosives from destroying the world. cant here be a config so it does not destroy blocks

Because those explosives are design for mining usage, It's not design for battle, But I'll like to see some explosives for the battle, Those explosives does not destroy blocks when safe mode was on, It's only damaging the entities, It can been triggered by different ways (Time fuse, Remote detonator, Redstone signal... etc..)

Weapons explosion damage can be blocked by using safe mode. (Which can be enforced for non-ops in config file. Also there is a permission "techguns.allowunsafemode" which can be revoked from players when you use a Forge based permission mod.