Quote: "1. Is it possible the make grenades "grenades" not a weapon. E.g. right click to throw grenade."
No sorry, not without a mod.
Quote: "
2. Is it possible the make a flash-bang grenade that applies white to the screen if within like 15 feet of so."
I have heard of this wayy....back when these forums were small a FPSC bigshot called butters did something like this
Quote: "3. Is it possible to make a person only able to carry two weapons and use "E" to switch between them. And also a pickup OPTION not just instantly pick up the weapon."
Again you could, but I think with a mod you could alternate between weapons. Other then that you would have to only have 2 weapons throwout the game.
Quote: "4. Is it possible to make classes?"
Hmm, this is a tough one I think you would have to make multiple .EXE's. Make a start screen showing the .EXE's to pick each different game (different class). This would require a multiple games just with different weapons try it out though.