Any way to disable motor output without affecting trajectory?

[maxvoxel8]

In a follow up to my previous question, is there a way to disable the output of a motor when in the step/direction configuration without affecting the internal trajectory? Something in the Gate3[].Chan[] perhaps? I'm looking for something that I can set and clear at the start and end of a motion to ensure that extra pulses are never emitted. Otherwise I will have to add a relay controlled by a digital IO, which seems like a roundabout way of doing it...