Oh right. I guess you'd at least want to display that field on the results page. It looks like that's in the do = 'find2' section. Maybe you just need to add ifs for your field and add it to the $header and $cell arrays like the others are doing, but I don't know. You might also want it on the standard user edit page.
From your other posts here I'm guessing you're capable of figuring it out, probably even faster than I could

Or maybe someone else already knows.