One of the only features EMC is missing when compared to standard industrial controls is a Rapid Feedrate override. The idea would be to slow just the G0 moves for proofing out programs while leaving regular feedrates unchanged. Typically machines will have a number of options like 100% 50% 25% and then one that is very slow. 5% or so.
It would be nice to be able to change these feeds independent of the programmed g1, g2 and g3 feedrates so you would not change the parts finish.