Cèsar de Quart 说:
But can you create new menus with their own layout? For example, to make a step in the character creation in which you can choose your nation, not by choosing from a list, but by choosing from a map, or a sidescroller, like 1257 has made when choosing your starting faction?
Yes. Those aren't called menus, but presentations. Anyways they are perfectly possible to make.
I wouldn't expect anything great from my side though, since I havn't worked with presentations before, but if you come up with something I will give it a go.