DelayWithMaster is quite tricky and unfinished command...
Only the [0.5 1.0] range is used ([64 127] in MIDI) and represents how the deck is delayed compared to the master. The [0 63] had been reserved for negative delays but never used till now...
I need to check (it's been a while I made this ^^), but I guess there's no possibility to "change" the range, sorry.