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We are working on a Drupal 7 port of the administerusersbyrole module in. @axel.rutz already has a working version up in his own sandbox, and I have filed patches against that. We are using the module already. We really need a to get the sandbox project moved to the 7.x-1.x branch of the administerusersbyrole module so that others can more easily access it, help with development, and log/track issues. Working in an ticket that has almost 60 comments and is almost 2 years old is simply not workable anymore.
If you could grant me co-maintainership of the module, I'll happily pull the code together into a D7 branch and help get it to a release ready state.