There are writers who will have no truck with genre fiction. Writers are an opinionated and cranky bunch who will require a lot of hand-holding to draw them out

There are writers who will have no truck with genre fiction. Writers are an opinionated and cranky bunch who will require a lot of hand-holding to draw them out into a community. May I suggest that you give this problem (and the more general problem of how to create and foster communities) its due weight? This is not a problem to be treated idly or easily solved with some clever tagging scheme, it is the central question of your site. It is probably worth working with someone who has training or experience in this area explicitly.