I'd really like some sort of citation manager that uses a .bib file as the data format.
E.g. I can change the bib entry name, put a comment `% alias: old-name` above it, and my auto-fix script will go through my tex files and update them accordingly. This is helpful when I found out later that I had a duplicate entry, or when I just want to rename the bib entry name.
It is sometimes a bit ambiguous when there is an Arxiv version from a different year than the proceedings publication. In that case, I use the proceedings publication, with a reference to Arxiv as well, and I set the year to the proceedings publication.
I have a consistent format for pure Arxiv publications, using misc, and not article as Google Scholar would output it. If I have this inconsistent anywhere, my script would auto-fix this to make it consistent. Or if some entries are missing, it would automatically complete them.