Then it may be only in my case, cuz it is not as easy for me. I got used to my problem here, but if it is not the case for everyone I'll have to tested more.
In my case 1xLMB makes my character run or walk. 2xShift do the same, and then 1xLMB do not work. if I 2xShift to make it run i can hold shift to walk, but if I 2xShift to walk the hold to run option does not work.
Now that i have a gun i'll be able to test new thing. Hope i can get trough it cuz i prefer to run with shift