There are only 2 things that I now perform to eliminate lower back tightness and SI joint pain -- the inversion table were I hang for 15-30 seconds and return upright (maybe 10x) is the first. The 2nd thing was returning to lifting weights to strengthen my hamstrings, quads, glutes, etc.
You are quite right that 'automatically' it is just competition scores (using CSS) that will be entered for handicap purposes, however you are able to nominate supplementary scores (using SSS) to apply against your handicap (as long as you alert the pro before the round that your card will be so, and the card is verified by a member of the club you are playing at). As with most things golf related there are various caveats and complications but that is the gist!
I would presume that the move would be for CONGU to be more inclusive of rounds rather than the other way round, since for most players - especially casual ones, the complaint is how difficult it is to enter enough (if any) competitions.