i dont think that you will agree on the new weapon in cs2d but here goes nothing!
A stachel! the stachel charg when you drop the the stachel back pack you get a remote controll and you can use it do detonate the stachel! + not to make it soo hard i recommend a maximum meter like you need to be maximum 20 or 15 steps away from it to detonate not max thean 20 or it wont explode!
Second Idea "headsup display" like if you walk in to fire or steam you will get a small icon showing what it looks like Like the radioation sing or toxic sing!
i dont know if it was suggested but why not make a moving functions! like moving breakable boxes and things like that!
To move sertan boxes For instance when you want move a box near a wall to block the entrance for time! something like that!
Hope you like my idea! p.s. Sorry for my english!