feature request: new options for sorting

Hi, i have lots of feeds in different folders. If i choose "unread elements" i get all unread elements in a sorted order, the newest first or last, these news are completely mixed from all folders / groups.
I would like a sorting by groups / folders and the entries sorted by date ... this could be a big list with all entries like the actual list, when a new folder begins there could be a line (like html-hr) and a header with the title of the next folder and then the entries.

Sorting options for the unread items would be:

All entries: New -> old (regardless of the folders) like now
All entries: Old -> new (regardless of the folders) like now
Ordered by folders/Groups: New -> old
Ordered by folders/Groups: Old -> new

the whole tree of the entries in a flat list ...

Thank you