Perhaps I am just ignorant but what is actually the issue?
I have always been attacking all creatures on a square then press "0" and repeat the process...
On the old map, you could open the combat log, and press F5 (refresh) to do another round.. and you could press F5 quite fast and the kills would tick in (with AM500 of course to ensure the spawn).
On the new map you could do 111122223333 etc (or more for that matter) before you needed to hit 0, so each refresh would give many more kills than the usual 123456789 0.
This is no longer an option, for whatever reason. And I am not buying the "it was causing issues with the servers". The above has been possible, and done, in years - without that being the issue.
It made annoying tasks more easy to do, and hence less annoying. As it is, those who need to burn big stam banks on farming, hunting, whatever on the world map, have to use a vastly increased amount of time on doing so - and still run into the old "Error Error Exterminate" msgs, so it hasn't done any good.. quite the opposite actually.