Quoting Mochan
I also have 4 keyboards one normal one, 2 Logitechs, 1 A4 Tech Gaming Keyboard and 1 Belkin N52 TE -- which I should also review. I couldn't really get into theBelkin, though, cool and geeky as it was. It just didn't have enough buttons; as someone who's been playing FPS for more than a decade certain controls had been hard-wired into my muscle memory and using 1,2,3 and 4 keys for switching weapons was one of them; this was the Achilles heel of the Nostromo N52.
I don't buy that. There are 20 buttons on the face of it with the ability to scroll through 3 key settings. That's 60 buttons.
I set up the d-pad to do my weapon switching - try that.