I would like you to please enable the Extension:BlockBatch i Need it for Mass Changing blocks on a bunch of spam accounts and could use it.
This likely will need a security review, unless it's used on at least one Wikimedia wiki. That being said, though the extension is tagged as unmaintained, that in and of itself is not necessarily a problem. This does seem to be a rather simple, uncomplicated, and benign extension, similar to a parser function extension. Additionally, I can see use cases on multiple wikis for local sysops to block spambots en masse, as an example.