1: As far as I am aware, current procedure for assigning seeds in event of "ties" is "first in, first seed". In the case of several players with identical ratings (or all of them on the day of a reset), I would assume seeds woul;d be assigned in that manner. Another option would be random seeding, shich would make the point moot, and would be my suggestion to TDs.
2: TD's only control over seeding is "random" or "rating". There is not now, nor will there likely ever be, any protocol in place to allow manual seeding of tourneys.
3: On the subject of separate lists for premium and guest players, I'd personally think it would work the other way: the guest who has just joined Elite and sees her rating climb nicely will be more motivated to join, I'd think...