if you want to have an on/off feature for speed up, hold left and then right click. if done right, it will hold until you click on the flash window again.
alot of people play games just for the sake of progressing in something. when the game has a hazard that removes progress (getting a survivor killed) the game becomes very annoying. i have been playing this game all of the time; i no longer feel the need. whoever instilled the rule that survivors get killed need to die.