I haven't really looked into parallel compression to much, tbh. there are quite a few comps with a mix option, though. I think rough rider offers that feature, for example. Or maybe fabfilter's pro-c, which is great i think. I can not afford that, though; and couldn't fully utilize it, if i stay true to myself.

Topics that also haven't been discussed here i think include m/s processing (also stuff like the m part processing/compressing the side signal; as illustrated in the fabfilter pro-c presets by bmanic). Or the ratio of rms/to peak and how to better it --> saturation .... Or controlled clipping on purpose (christian w budde has just recently published a plugin doing this). Or transient designers. Schaak audio have one out which i think is great.

I just enjoy reading stuff like that. No more, no less.