There seems to be a lot of complaining about the lack of hot keys in Multiplicity 4. I am also slightly flummoxed by this. In Multiplicity 3 it was really nice to press Ctrl + Shift + ' to open the remote window. Trying to get to a remote PC in KVM mode seems really clunky in version 4, and it is also really hard to get back to the local desktop without closing the remote window. This seems to be a bit of a downgrade from version 3.
In addition, there is a button on the KVM screen that says 'Create shortcut'. I've no idea what this is supposed to do as it's grayed out. Right-clicking on the remote computer gives the option to create a shortcut on the desktop; this is pretty useless for me as I'd have to minimize half a dozen windows to see my desktop. How about an option to create a shortcut in the start menu.
Other than that it's great.