Manual Pulse Generator Question

Gentlemen:

I have been considering adding a manual pulse generator to the CNC
controller which I have built. My questions are:
1) Will ONE MPG be used to operate all (3) or (4) axes?
2) Are the pulses multiplied by 1, 10, 100 or ??
3) Is there a max feedrate applied to the MPG input?
4) If the speed is fast, is accel and decel applied in the system?

Thanks for your comments here.

Merry Christmas to you all,
Jack C.