As far as I can tell, this mod forces futas to have balls. Is this correct. The base game option is still present in Options, but even with set to no balls, all the futas I've created have balls.
Yep, that's correct. Original game has some kind of bug, so generic slave\peons futas (these generated at slave market, guilds, dungeons etc) won't be given balls even with "futa balls" option turned on. So I removed "futa balls" option check. That's why all futa have balls regardless of options.