Thanks, John – definitely some great reading on customizing WordPress administration Filters. I’m still searching for a way to query the columns using the search users field. With 900 members searching by roll seems the best option.
Thanks, Jemmy, for taking the time to share your code. You have an impressive profile—unfortunately, the code, when added to my funtions.php, throws up a few errors.
Parse error: syntax error, unexpected '(', expecting variable (T_VARIABLE) or '{' or '$'