[FeatureRequest]: Extrude control in mm/s3 (flow rate)

[jaysuk]

Is your feature request related to a problem? Please describe.

It would nice to be able to toggle the extrusion control buttons so flow rate could be used rather than feed rate.
This would be especially useful when calibrating the flow rate of your hotend when using different materials
See https://forum.duet3d.com/topic/32483/feature-request-extrude-control-in-mm-s3-flow-rate

Describe the solution you propose.

Switch between mm/s and mm/s3

Describe alternatives you've considered

Manual macro buttons

Provide any additional context or information.

Ex. Photos, mockups, etc.