Flashbangs and smoke grenades.
At the current state of the game there are only 4 unique throwables and it needs more diversity

For the flashbang, I think the one from breachers would be a perfect fit here

For the smoke grenade, I think the one from breachers would be a horrible fit, instead it should shoot out large invisible spheres(~3) that can collide with the environment and create smoke particles. This way you can cover a good area and if you have a good eye (or perhaps a heat vision scope for those recon players) you could still see through it.
The smoke will however probably cause some lag so a optimisation toggle could be implemented to make the invisible spheres make less particles in exchange for them being bigger.
Thank you!