Guys;
All that stuff sounds good to me!
I think you should just enable all the options and leave it up to the user to decide what they want to have for "their" otherpower page. Make the default simple so it always works of course.
A simple "all postings since last visit" page be extra nice and maybe more comfy for the people who like the old board.
Personally, I would like all new stories including diaries on the "all sections" page maybe its doable now but it is not obvious how.
Basically my opinions and unlikely to be shared by others.
Cheers.
TomW