I've been using this plugin for Firefox:
https://addons.mozilla.org/en-US/fir...ddon/checkfox/
However, it only works some of the time and it's a pain highlighting and using the check/uncheck option when it doesn't work. I've tested the forum with selecting 400 users. That works. I'll try 1000 tomorrow if it works.
The problem with vB is how archaic its design is. It prunes users on one page of 100, then makes you proceed to the next page where it deletes another 100, etc. This is probably the reason it chokes with so many users. I'll let you know how many it can delete in one sweep tomorrow.