variable encoder steps for varying extrusion print speeds

Running a filament at different extrusions rates obviously alters the backpressure so trying to put a 'correct' value in config.g is confusing. One of my 1.75mm PLA filaments would change as a much as 6% between extruding at 1mm/sec and 5 mm/sec (albeit 5 is a little over the thermal volumetric limit for a V6 heater block)
So temperature, extrusion rate, and nozzle-size can all impact the correct encoder steps for a particular print.
Is there a facility or plans for accounting for these? Pressure-advance can only adjust for some established amount of filament-compression (or bowden) so not sure that can be a cure-all, and does not track any of the mentioned variables that impact extrusion rate.
thanks

You can adjust for extrusion rate. See [duet3d.dozuki.com].

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].

argh, every time I think I got the command set in mind I discover something new, that's great! thanks for the reference.