Are there any messages that show up when a window is restored from the minimized state, other than the "Got Focus" message (to the main panel callback)? I need to know when a panel has been restored from the minized state (the user has clicked on the taskbar button) and is being used again. Other than the flag that set whether a child window has a separate taskbar button, there seem to be no signals or functions regarding this at all.
This is not currently possible. However, this suggestion has already been posted here, and you might want to add your own vote to it, in order to increase the likelihood that it gets implemented.
