Hi! Thank you for your questions. In regards to a) I've changed the nomination format to "Character A doms Character B" in order to be more clear. For multiple character ships, it would be "Character A & Character B dom Character C" or "Character A doms Character B & Character C" and so forth. I wanted to make it more clear that characters are not required to self-identify with being A Dom or A Sub, or have a concrete identity as A Dom or A Sub, but simply that they're taking on a more dominant or submissive role within the context of the story. Because of this, it won't be possible to indicate if a character is a switch. Though they may very well be a switch, within the story they should be acting as either dominant or submissive.
b) No, since the exchange is focused on females acting as doms, male characters will not be accepted as doms even if there is also a female dom in the story.

I hope that makes sense. Feel free to reply if you need any further clarification!