Hi Acken
1) There is a mod out there which lets you capture Great People and Settlers and it works with this mod. I know because I have it. Should be in the steam workshop if anyone is interested.
2) I have a problem with the mod.
The first time I opened the mod it was set to Demigod difficulty as default. I didn't know what it was and wanted to try your mod on Prince to test it out. It does make Prince a touch more difficult but still it's a walkover overall fyi. Of course you probably wasn't thinking of Prince when making the mod. I really like the mod however. I appreciated the addition of the word "truly" before "free great person" and the changes to pantheons. If you could add more specific descriptions on +x% City growth vs plain growth and universalise the "truly" free great person where offered that would be most welcome! As I understand it, the growth in Swords Into Plowshares and growth in the pantheon Fertility Rites is not the same as the growth in Tradition or in the Temple of Artemis. This needs to be made explicit or the growth needs to be universalised as raw rather than some raw growth, some growth to surplus.
Anyway, the problem is that Demigod disappeared from selection as soon as I selected another difficulty. Let me know if this can be fixed, aside from uninstalling/reinstalling, which I will try. Perhaps it's a bug that can be fixed later?