With regard to the suggested "Official" pinball channel.
Could there not be a 'go to' Twitch channel which can then host other peoples channels to stream the main shows that are happening right then.
They wouldn't need to stream any of their own content, but it would basically be hosting others peoples content, as it happens.
As well as meaning people could go to a single channel to see what's happening across the Twitchosphere (?) but it would introduce them to other pinball channels.
Ideally it would have a few 'administrators' across different worldwide time zones so there would always be someone who could switch to a live event.
There could also be a short promo vid, listing all of the pinball streamers so people can visit them at will and look for their archived material.
I don't know a great deal about Twitch, other than watching it, but does this seem feasible (if not necessarily a great idea).
Pinball_Live isn't on here, so won't have seen any of the comments regarding his streams, but I'll try and get him to sign up and give some of his tips. The most well received comments seem to be about the live sound and 'bob cam'.