New to LEM - can I stop certain logging - such as Network Logins?

This is handled under the policy settings. 

Manage -> appliances -> gear/edit -> policy.

Then you can tweak your settings.

Thank you..!  very simple and quick to configure... I appreciate the help.

I've made the changes to start with - do I need to apply these changes to all my managed nodes - or is this automatically done.

Nope all you need to do is edit the policy and its good to go.

Thanks again - 2,400 events per minute - now down to 50 or so...  most excellent...  I can now look at this thing and not get dizzy...!