I wanted to swap Venus for Mercury and to avoid unbalancing the Terrans overly, wanted to change Venus' type to Toxic Atmosphere & Mars' type to Barren. The Terrans then have three potentially habitable planets in their home system but they have to work for them. However, the parser seems to just skip over the tag (which is far preferable to crashing...) So, is it somehow hard-wired that all habitable planets in a race's home system are habitable by all always? (I read the office modding guide & the section about custom planets doesn't mention at all, so I'm guessing that I might be out of luck here.)