some suggestions for ac(graphic and gameplay)

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I use when I want to play seriously, because you need to learn to aim well, kill with the rifle faster than any other weapon(ok, in some situations, shotgun or sniper is better, for fun, i like more AR, and rarely i use the sub, In general, the carbine is better for me)

If you had good aim, you would actually use the sniper. You talk about playing seriously, but you've never played in an inter before.

Also, if every weapon dealt more damage for shooting at the head, people will die wayyyy too fast. The heads in AssaultCube are huge. It's already very easy to run away headshotting people with the sniper. Seriously - you can already run around in a pub and rack up 60 or 70 kills with a sniper while only dying like 20 times, lol.