I would like to be able to use diag_log to get more useful information about signature kicks and related things from the logs as currently it is very difficult to work with clients on debugging signature issues from badly signed mods, etc.

I would like to be able to use diag_log in the server.cfg event script lines:
doubleIdDetected = "command";
onUserConnected = "command";
onUserDisconnected = "command";
onHackedData = "command";
onDifferentData = "command";
onUnsignedData = "command";
regularCheck = "command";