If you chose to use ‘empty space in sample’ method for all steps , to get the most range out if it you’d need to also initially setup micro timing to be tweaked to the left most value.
The ‘fine tuning’ of the timing is then down to sample start point . I haven’t looked into the maths but I guess it’s a higher resolution to microtiming on the step.
If you also use this principal for bass , synth , acid loops etc , it allows quite odd timing changes by altering 1 parameter per sample.
To be honest , after the novelty of getting this to work , it’s much easier to just go back to normal and keep things simple.