I have noticed that some players have alt camping near WB respawn points such as the Giant in silverspring. And they activate their alt just for killing the giant when it pops.
This may be considered as a king of boting.
If you want to increase the challenge and the competition between players, it might be interessant to implement some kind of "inactivity timer" which force deconnection when zeroing. I have seen this on other mmo.
Of course there should be exception such as afk-ing at home, in the castle, near instance entrance (for buffers) or generally speaking in towns/villages.
I assume of a 5-10 minutes timer should be a good value.
Regards,