Hey OnefinityCNC,
what I would like is if you provided access to the internal axis control lines like Buildbotics does now on their 15-pin Auxiliary motor control port:
Image: Comparison of recent Buildbotics controller (above) and Onefinity controller (bottom): The Buildbotics now has an additional 15-pin Auxiliary I/O Port for access to the axis control lines.
This would allow to circumvent the internal four Texas Instruments DRV8711 stepper drivers and to use your own stepper drivers, and other stepper motors. This would need no change in the circuit itself, but only re-design the pcb to provide access to specific points on the pcb.
The pins available would be the same as on the Masso G3 for connecting stepper motors:
This would allow users to connect other stepper drivers, e.g. to retrofit closed-loop stepper motors (as used on the Masso, or to connect closed-loop stepper drivers like this one), or servo motors etc. to the PRO/Original Series Onefinity Controller.