[ffcmike]

If you do a tiletype or onwall or even a function for your own scripted tile detection on an out of bounds coordinate (ie: -2, -2) that should always be returning true, should it return false the player is likely memory editting.

Though in the case of speed hacking it's alot more complicated if you haven't scripted your own movement as you haven't really got a reliable way to determine how far you should be moving and comparing it to the actual amount you then move in the same process, gradual increases of X/Y on arrow key presses seem to be the way speed and wall hacking occur most frequently (WSU), seems 100% reliable for catching it on Classic and no false alarms as of yet.

For programs that increase computer speed/client framerate it's something you could possibly detect by scripting your own server-synced timevar2 clientside and perhaps every few minutes triggering to the server and comparing it against the servers timevar2.
I haven't really tested anything towards this though, maybe there would be an easier method.