[Mantis] View Issues Progress Counter
One of the things which has always annoyed me when doing bug triages is when someone asks how far through the list we are, as Mantis doesn't have a handy way of seeing your progress other than "well, I said 100 bugs per page of results, and I know we haven't reached the end of a page, so it's somewhere between 1-100 of the 853 we have to review today".
Read how I added a little progress indicator into the page so you can see what report you're on / the number of reports in that filter (or at least the number on that page of that filter).
[Mantis] Bulk Detach Tags
Recently, I had to remove a lot of tags from a release on Mantis, but this highlighted that although Mantis has for a long time supported attaching tags in bulk to a lot of reports via one button click, it has no ability to bulk detach them later on. So, I select 100 reports in View Issues, click the action groups command to Attach tags, add my tag, click go. Done. Later on, if I want to remove those tags, I have to find and open report 1, click the red X next to the tag, find and open report 2... And so on.
Read how to add this bulk detach functionality yourself.