Seriously: winRT wasn't around when mobl was first released. It's fair to say things slowed down a bit due to resource constraints (although another release is in the offing - see separate thread). WinRT isn't on the list iirc. However: mobl is free and open source. I'm sure the developers would be happy if you added win RT as a target. Support on this llist is good. You might want to think about asking a bit more politely though.
- S.