Shia and Sunni Islam can at times have a huge "view difference". How will the moderators, community and the rest manage this?
Most of the differences are in belief; less are in action. I don't see any reason to distinguish unless the question specifically asks about one vs. the other.
Tagging would also help. What I'm proposing therefore is:
- Most questions don't distinguish between Shi'a and Sunni
- Questions that are specifically about either can be tagged as such (e.g. what is the view of Shi'a/Sunni Islam on ...)
I think allowing both to answer is fine, a question can have two answers from both point of views as long as the answers are directed to answer the OP's question and not to reply to the other answer of the opposite denomination.
Its quite healthy to have opinions from both sides. We get to learn about each other. It would be good to always specify from whom one is quoting from so that the reader is made aware about which sect the answer is from.
Having said that, such questions have been seen to always attract downvotes from the opposite sect. We should somehow stop this bias.