Hello Tag,

99% of the users will be happy to have the option when double click on the spectrum/waterfall signal to tune the main radio to that frequency.
One click will do the same as up to now, tune to that frequency on the SDR#, double click will do the same plus tune the main radio over the CAT to the desired frequency.
Possibility to choose whether the CAT will do that on VFO-A or VFO-B or on the Main or Sub receiver is like driving the Mate Rimac Concept One car :-)
Changing the modes and other features is handy but not so important as tuning the frequency,

Adam