conventionally, Q3 client chose to use forwardmove/rightmove/upmove values in [-127..127]. -128 can also be used, and is passed without checks. this can be considered a speedhack, which can give you a 0.78% boost in running speed.
Created attachment 2995 [details] disallow forwardmove of -128
I'm making a note here.
huge success (revision 2214)
Created attachment 2995 [details] disallow forwardmove of -128