Do you hate it when your craft is tugging along on SAS and you want to correct the course a bit? You touch pitch controls and it gets all wobbly.   There is a simple solution to your problem: SAS should not control the control input, but work via the TRIM settings. You control input would be combined with the TRIM and you would have perfect controls even with SAS activated.   Better yet: Allow the TRIM settings to be kept when leaving SAS (maybe with a modifier key or so) and