You can easily enter a spindle speed command. Step through the parting sequence in Single Block and look at the code; you will see something like this:
M03 S2000 (or something like that)
(there may be an approach move just clear of the part)
G00 X0.5 Z-0.215 (move to part-off position)
G01 X0. F0.003 (part down to X zero)
(retract moves)
What you want is:
M03 S2000 (or something like that)
(there may be an approach move just clear of the part)
G00 X0.5 Z-0.215 (move to part-off position)
G01 X0.1 F0.003 (part almost to the drilled hole)
M03 S500 (slow the spindle)
{Optional M code to turn on shop vac}
G01 X0. F0.003 (part down to X zero)
(retract moves)
Have your shop vac pick up tube just beside the parting tool. Actually you will need a stub of tube fixed adjacent to the parting tool and this comes into alignment with the tube running to the vac that is mounted on the cross slide out of the way of other tools.
An open mind is a virtue...so long as all the common sense has not leaked out.