1."Does it do feedrate calculations for combinations of linear and rotary axes? (Moving near or away from the the center of rotation and still honoring the F parameter in mm/s.)"
2. Can it act in a closed loop control system, with linear encoders giving the feedback.
In angular mode you or the CAM software will have to do the feedrate calculations as you go away from the center of rotation.
Encoder feedback can only be connected to the servo or stepper motor drive and then an alarm signal can be wired back to the MASSO but cant do a fully closed loop setup using linear encoders directly to MASSO.