It allows to control the spacing vs width (10%% fill vs a bit less)
The 'enforce 100% fill volume' is also adjusted to take that into account
Note that if you're using multiple extruders/filament everywhere (and spacing setting for width setting),
the result may be a bit unexpected, as the gui can't display all the interactions,
also some features (like support) may revert to default overlap value, if printed with multiple filaments.
supermerill/SuperSlicer#1590
also some merge for creality printers, and fix some problem in it.
relax the min/max version for the profile, i don't have the resource to check & modify these for each release.