(Please just point me to where I can read up on it if this feature already exists!)

It would be nice if one could set different calculations not only for different zoning types, but also for different building themes (or district styles, if playing withlout the building themes mod). To name just one example, American detached houses (especially the vanilla assets) often have very tall roofs. When using a floor height of 3m, Realistic Population often detects these roofs as floors. For an American style suburb, one might just increase the (first) floor height. But if in the same city I have a different suburb with more central/western European style detached houses, I will need the 3m floor height calculation (and also multi-story households). If I could attach a calculation to a building theme, it would make it much easier than manually overriding the floor height on each asset.

Bonus points if it would be possible to make the calculation and possible overrides a direct part of the building theme. In an ideal world, I could create and share a building theme with all the population already set for users of the Realistic Population mod.