Modified G Code authoring for Multicam Router Table/ Slew Feed Alteration

Has anyone programed G Code for a Multicam controller that uses software ports on a CNC job such as G98 P<n> S<string>

I am looking at port 201 and changing the slew feedrate, to lower it.

You can get in and I was sent instructions how to modify ROM to slow it down but it came with warning at your own risk. My abilities are in design and part coding only, not with specifics and keying to change hard data on a ROM chip so I said no and be safe.

In our work it is not necessary to slew and the highest speed at all and in fact motor faults occur from time to time because it is set to high, probably set a carving wood speed.

Any help much appreciated, thanks, Richard