Just hit 400
I don't know how big of a deal it really is, here's a summary of browsers used in a 24 hr period from the server log file from two days ago. Shows browser version, pageviews, and uniques. IE 11 didn't even make the list.
Jeez, all those browsers, all the possible configurations of each browser. It must be hard to find a balance.
Accounts that I believe are bots now seem to be starting to get through existing measures and are appearing as valid registrations.. Thankfully still no posts have been made, but I worry that it's not going to be much longer.