threaded subjects / tree view can't be sorted

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Just started using eM 3.5, switching from Thunderbird. I only have a couple of problems/complaints, but this is a big one:

Threaded subjects should not be a sort option, but a view option. That is, I would like emails to be organized by tree, but *then* I would like to sort the trees by date, sender, etc, according to the last item in the tree. This is standard in both Outlook and Thunderbird, and causes subject trees with new emails to appear at the top (or bottom) when sorted by date. As is, I find myself flipping back and forth between sorting on subject and sorting on received date in order to find which subject trees have new emails. Very frustrating.

Is there a fix, or is there the possibility of one?

Much more minor note, but the subject threading takes up too much space, be much cleaner if the threaded messages just stacked with a plus sign out front.