Allow multiple themes for world builders

I do not know how difficult it is for Franz to understand for example to narrate a world that is Fantasy and Survival and Horror elements for example. Or a world that is Isekai and Urban Fantasy and Japanese Mythology. Or a world that is Regency Era, Historical and Political Intrigue. I think to be able 2 more Themes would be cool and make a world more dynamic and intresting- if Franz is able to grasp what the Themes entail narrative wise.