General Answer
This question asks about Code Review's own community projects. I think it would be okay to make a tag for these, but I think not simply Code Review's community project.
Any open-source project should feel welcome to ask for reviews of their code, and even host official-to-them code reviews over soon-to-be-committed code here on Code Review. Eventually, with enough interest in high quality questions & answers, perhaps it may be time to create a tag for that open-source project.
Importantly, though, with these sorts of open-source-project tags, I feel it is necessary that they have a very good Wiki entry, and perhaps most importantly, a link to the repository for the code within the description for the tag.
Also important would be making sure the tag names themselves are clear and distinct.
Specific Answer
rubberduck-vba seems a clear enough tag to me, but if we do create let's be certain we set this as a perfect example of what any other open-source-project's tag should look like on Code Review:
- Make sure anyone on Code Review involved in the project goes through and tags all appropriate questions with the tag.
- Make sure the Wiki has an excellent description of what the goal of the open source project is, and include a link to the repository for the project.
