| Kayerloth |
Sit probably as long as you aren't moving ... I'd probably allow this.
Ditto for lying down.
I'd pretty much let you treat the air as if it were solid ground.
But it is not flying, and I probably not let you move any more effectively through the air in the lotus position than I would if you were sitting on the actual ground and trying to scoot along on your behind.
RAW I've no idea big grey/GM's decision area.