Another question: can you have the values of some or all of the custom fields show up in "forumdisplay" so users might be able to more easily tell if they want to click?
Or better yet, how does it work on this site (vBulletin.org), when you're searching for mods and there's that row of dropdowns at the top and the "Show Mods" button?
Here's an example:
https://vborg.vbsupport.ru/forumdisplay.php?f=194