They usually wait and see how these discussions turn out here in the SFF forum before responding. As it stands, this request has not been met with unrivaled enthusiasm.
@arn and the admins have been keen on avoiding forum bloat, i.e., creating too many sub forums that will generally be inactive.
The Special Interests forum, is organized with functions that tie directly into using a Mac. Graphic Design, Digital Videos, Digital Audio and to a lessor extent photography are activities closely tied with Macs. The software and specialized skills are such that having distinct forums for those areas makes sense.
Writing doesn't have that level of immersion in Mac ecosystem. I'm not diminishing the skills needed to write but its not a technology driven specialty that has close ties with Apple products and services.