running feels a tad stiff and weird, have you considered adding a slight viewbob? also maybe the option to choose between non-regen and regen health would be awesome, another thing that would be neato but not required would be if the crosshair could be changed and colored, either way this is an amazing project! if it ever reaches mod support and becomes more popular im sure this could be an amazing zombies replica!
*edit
also, forgot to mention the lack of sprint toggle! keep on the good work!