I need IIS Snapin to restrict to a single window

In the ‘I need …’ feature request series, the next proposition that I would go about suggesting is to have the IIS Snapin (inetmgr.exe) to be having an option to restrict to a single window. This is because if one window is already  and I open another one, I may inadvertently overwrite the settings between them.

There should be at least an option to monitor existing windows of it and disallow new windows (or seamlessly target the existing windows) like that in WinZip.