Marco,
Our whole point of getting away from VSS and MS SCC is to get away from outmoded version control systems.
I couldn't find an HG interface for MSSCC, and even if I did, it wouldn't have the 'merge' and 'push' and 'pull' capabilities.
I wonder what other users with this combination are doing.
Any plans on writing an interface for DVCS or SVN in the works?