This setting does exist, and simple search of the config file, reveals it isn't contained there (but should be).
I did spot the "quiet-reject" setting which you may like to set to 1.
I had to delve into the sourcecode for the rest of it.
Try setting the following settings
Make sure net-type is correct for your server
set use-penalties 1
set use-fastdeq 2
This should get you a little more headroom, and might prevent your bot flooding the server a little.
However, this still leaves the root cause, which needs to be fixed.