Right clicking and holding will "cook" it.
Riflemen
Agreed but you can mod it for a CoD4ish sight at FPSb.
http://www.fpsbanana.com/skins/49626
I'm not too sure about this one, I actually prefer the AK to the M16. For the simple reason that if you get surprised in close quarters you can spray with the sight and it has an option for automatic. And IMO I think the AK 47 is pretty accurate in this game.
Agreed on the viewing, you can skin as a G36C and have god sights.
http://www.fpsbanana.com/skins/49119
Are you sure it's single shot? I swore it was automatic and single. Maybe you hit the toggle switch? IMO, this a really easy gun to use - the sight is so so, you gotta learn to aim at the top thing that sticks out. And close encounters are a plus for this gun, little to no recoil for close range no scopes.