Bind to delete the blood:
-> bind (You can put whatever key you want!) "r_cleardecals"

For exemple:
-> bind m "r_cleardecals"

You can bind it to delete the blood when you walk:
-> bind w "+forward;r_cleardecals";bind a "+moveleft;r_cleardecals";bind s "+back;r_cleardecals";bind d "+moveright;r_cleardecals" (Doesn't work in CS2 for some reason!)

-> bind w "+forward;r_cleardecals";bind s "+back;r_cleardecals"; (Works in CS2!)

Bind to jump:
-> bind (You can put whatever key you want!) +jump;

For exemple:
-> bind m +jump;

Bind to jump with Space and Mousewheel:
-> bind mwheelup +jump;bind mwheeldown +jump;bind space +jump

Bind to jump with Mousewheel:
-> bind mwheelup +jump;bind mwheeldown +jump