Actually, I've used a standard scale Ibanez in G# standard without any intonation issues. Kept its tune very well too, i should add.
I've also known plenty of people who downtuned their SGs just as low without incident. So no, shorter scales do not necessarily equate to intonation/tuning issues.
As for 27" scales, I prefer my strings loose, so again, a shorter scale will serve me better, I think.
My only previous experience with EMGs was with the 707s. Thought they were serviceable, but I wasn't really head over heels about them either. Have any of you found the 81s to be tonally superior to the 81s?