I agree that getting more people involved (by crowdsourcing or other ways) will be beneficial to the project. But it'll depend on how the effort will be organized.

My experience with the website is that the original uploader can edit some part of the "metadata" (not all) of the uploaded document like title, description, topics/tags ..., but they can't move it to a different collection (initially the document is uploaded the "community" collection).

If they want to put it in a different collection they have to contact archive.org's staff.

Sometimes the staff notice the new files and move them to the correct collection or even create a new one for them (the latter case happened to me).