modding question: planet sizes

[dogscoff]

OK, so I'm making my own remix of proportions mod, and I want to add a bunch of new planet types.

I want to add another class of planet below tiny, for tiny asteroidal lumps that can be colonised but are too small for facilities. I was going to put these in orbit of regular planets and into asteroid fields. Thought they would be handy for cargo storage/ population growth/ establishing outPosts.

My question is this: What does the
Stellar Size:= Tiny
line do? Can I change this to some arbitrary value, or does it have to be one of the well-known values? If I leave it as tiny, am I going to have trouble generating systems?

Similarly, I'm going to want to add another size above huge (massive). I'm sure someone else has tried this, can it be done?