Something which would be really useful would be, when trying to open a workspace which is already open in another instance of the Studio, instead of refusing to open it, the Studio could open it in some kind of read-only mode (or offer the option of doing so).

When trying to migrate a Windows system to the Web, it would be a huge time-saving if we were able to have the Windows project open side-by-side with the web project so we could trace and replicate its functionality on the web side, without having to change projects to see what is happening in the Windows project before switching back to the web one to implement. I can't tell you how much I need this right now.