Idea for spectate option - auto join party of the person you are spectating

I wondered if we could add an option for spectate where, if possible, we could auto-join a friends party after spectating. Why? Well, if a friend is in a game, and I want to join them, I'll often spectate their game while I wait for them to become available. Of course, sometimes they miss my IGM and start their next game while I'm still spectating their original game. Now that we have the party function, it would be sweet to be able to have it automatically join their party if possible.

Thanks for the consideration,

Magneto