Request: Ability to set known device error (say in PPM)?

[TheOriginalFreddoFrog]

Is it possible to add as an enhancement at the setup phase a known PPM or fixed frequency error correction value?

and/or for future down the line ...

Is it possible to load/develop an end user-adjustable table of known corrections that can be applied across the device spectrum range at runtime?

[pavels]

This can be achieved using IF frequency setting which can work as sort of correction