Regarding the custom game addition feature

[r-blackstar]

Some Unity games also support mod installation using the same override method, but they are not on the list supported by the mod manager. I believe we should allow custom game addition without restrictions.

[Kesomannen]

Do you mean adding games that aren't yet on thunderstore?

[r-blackstar]

Yes, some other games have the same mod installation method, but they are not available on Thunderstore.