Some dude named Heart Grenade made a free mode with a couple more options when you click a player, with some stuff like being able to increase dick size beyond the maximum. Also adds animations like fingering, hip movement and some other stuff. If you don't trust some rando to not send you a virus (way too relevant for here...) then you can get it also in #share-poses-and-scenes in their official discord. Just put the file in Mods/Scripts and load it in the 4th tab in-game.
I've also found it very easy to modify it so that you can pretty much increase anything beyond the min/max. In the file labelled freemodeGH_main.lua you can just go down to the "Illegal character customization" section and just add in your own stuff. Just add in something like this:
+ "Giant Body"
human.Body("Body size", 1.5)
return(1)
and that's it! I believe the base game sizes can range from -0.5 to 1, so anything above and below will be "out of bounds" (larger or smaller than normally accessible).
Couple things to note: I am no programmer, so don't ask me how this works. I don't know what the return(1) does, but I just put it in because the rest had it and it works for me. the "Giant Body" is the name, so change it to whatever you want (like "comically sized woman" or some shit idk). It seems like the general format for the various body parts is just human.Body("[X]", [size]) where X is the body part (such as Breasts size, Penis length, Hips size. I don't know if this is how all of them are formatted but from my experience modifying it this always worked, with the first word capitalized and nothing else.)
Hope this helps, and I am quite interested to see what comes of this. Hopefully this just becomes basegame so we can modify this stuff without having to reload the game every time we modify the file...