Hey Chris,
you mean changing feedrate on the fly? Someone with more technically ability is not the problem. What would be needed is that someone wants to do it, someone that has a reason to do this work. The creators of the Buildbotics Controller seem not to do it soon…
I would not wait for it on the Onefinity/Buildbotics Controller. It may be…
For me, there is no reason to use the Onefinity Controller (or the Buildbotics Controller, from which it is a hardware and software fork ) because there is LinuxCNC and I know how to build PCs.
LinuxCNC is very evolved and powerful nowadays. It evolved from the NIST’s Enhanced Machine Controller (EMC) project (See EMC History)