First, it's dead simple to add reverse to a HiTorque Mini Mill. A single pole, single throw switch (or relay) does it.
And the spindle speed is appropriate for a manual mill of this size. You can change the pulleys if you want higher top speed for CNC work.
The motor controller consists of two boards in machines with the brushless DC drive system. The main controller board is very similar in the Mini Mill and the 3501 CNC machine. I'm guessing that the small auxiliary board from the 3501 will also work with the HiTorque Mini Mill to provide Mach 3 control of the spindle.