Two of those points are already possible on the regular OSSC
Vertical stretch for PAL aspect ratio correction (squashed proportions in PAL has frustrated me for ages)
Reduce V.Active (e.g to 256 or 240), has the effect of stretching the image vertically.
Oversampling to improve pixel recovery on games that switch between multiple horizontal resolutions
OSSC is oversampling by default compared to 240p/288p source material (in generic modes: 858 samples in 2x mode, and even more in higher line modes (multiples of 390 in Lx3-4, 341 in Lx5).
For 480i/480p, oversampling can be enabled by “allow upsample 2x”.