"Old Wikisource" at www.wikisource.org would be better served if moved to mul.wikisource.org. "Mul" is the official ISO-639 code for "multiple languages", which is appropriate to this project. This would allow full interwiki linking, easier support from Wikidata, standardisation of URLs, and recognition as an active project. There is informal support for this in the Wikisource community on scattered discussions and the mailing list.
Before having a formal vote on this, however, (which is potentially pointless) I want to know if this action is possible. I was told a bug report would be the way to determine that.