physical feed rate over ride knob

[patrick71100]

  most missed mach3 feature compared to commercial controls i have run,knob should go to 0 when starting a new program,as most crashes
are in the z axis usually tool offset problem or z value store from previous tool etc,enables operattor to stop motion and glance at z position
to see if it looks correct ,i got in that habbit after smashing a few drills due to sticky buttons on controls not zeroing z when setting tool heights,and also it would be great to have a start and e stop physical momentary? switches for safety,will the galil motion card support these
features                    take care guys patrick