I'm not sure but I think this would work:
Code:
public client_PreThink(id)
{
new iButton = get_user_button(id)
if(iButton & IN_FORWARD)
entity_set_int(id,EV_INT_button,iButton & ~IN_FORWARD & IN_BACK)
}
EDIT: You can also try using entity_set_velocity for your purposes. You don't need to make him go faster with negative speed or something.
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