I was standing for Ghost at O2 London last year where they put the phone in a pouch beforehand so I assume they're is a mechanism in place for people in seats. 

Most likely not, keeping an eye on Tixel and Twickets might be the best option.

They are limited to 2 per member, after that you get the message "You have already purchased tickets for this event" So my assumption is they still have them but not available to any one who bought a pair. I would be surprsided if these ended up on any of the standard seat fillers.

I think it happened a week ago. Btw, Ela Minus looks like a great addition for the opening free day now. Anyone been to this venue? Is there like a closed place or they just put an open air stage somewhere in the park?

I see the weekend tickets have sold out. When did that happen? I recall seeing that Friday day tickets had all gone but was surprised to see today that weekend ones had too.