To help admins deal with the whac-a-mole problem of bad bots they first line of inquiry is to use Who is online and click the Display guests link to review the user-agent associated with all the guest sessions. 

It would be an improvement to aid the admin if there was an option to Display guests ONLY to refine the list and help in the quest to identify and deal with bad bots based on their user-agent. 

A second improvement would be to separate the user-agent field into a separate, sortable column.