http://bsvcflightschool.com/2015/03/09/advanced-hud-ifcs-and-itts-targeting-modes/
Try some of these tips for your MKB issues. Especially the CTRL+C and ALT+M.
Weapons issues: you may have run out of ammo out overheated them.
May be other things I'm unaware of, but them I'm not the most...