Rii i8+ Pendant - Rapid Rate Problem

I use an Rii i8+ controller as a CNC pendant. Overall, It’s been a wonderful addition, but I’m having one problem that I can’t seem to solve. When I hold shift and Rapid using the Rii controller, it ONLY moves at the highest default rapid speed, regardless of what the Rapid percentage/ipm is set to in Mach4. I can’t figure out why this is happening. I have all manner of things mounted on the machine, so the surface is normally very cluttered, and having the gantry move around that fast is a recipe for disaster. If anyone has any advice on how to solve this problem (programmatically or otherwise), that would be greatly appreciated.

Thank you

https://www.amazon.ca/Rii-Wireless-Keyboard-Compatible-Raspberry/dp/B00WQG6A8C

I use that same keyboard. Are you using Rapid or Jog? If you’re just jogging the machine, you can use CAPS + “direction arrow” and it will move the percentage you have the Jog Rate set.