I'm Suggesting to add the gravity knife, it would be amazing all players will love to play deathrun, don't want gravity than you can hold the gun if you need gravity just hold the gravity knife check this video
Deathrun + Gravity knifeName of the plugin "Knife Mod - Special Abilities"
download link -
http://cs-bg.info/plugin/873/i really wish it could be added
its quite wonderful, also it wont make any lag and won't make bad things it will let you feel flying, and players with low fps will be happy !
again its not like (DRshop) its just a small knife plugin, maybe it can be with shop like getting money by killing so as to buy it, but the idea of this knife is so perfect to me !