When more complicated problems with MCMS arise, I was finding myself wishing I could enable tracing to MCMS rather than go to support to solve the problem. Eventually I ended up using Reflector and finding the Switches MCMS uses internally. Being that none of these switches are documented anywhere else online, I thought I'd share the knowledge.

There are 3 Switches in total:

Trace messages related to authentication and authorization (I find myself using this one most often)
Trace messages related to node caching. Strangely enough, I have never enabled this one
Trace messages related to everything else

Please note that these are all TraceSwitches and therefore need a value attribute between "1" (just errors) and "4" (verbose)

I hope this helps someone out there who is having trouble with MCMS