@ivory A list of feature I think most people would like to see...

Load last position in timeline.

Split Notifications between "All" and "Mentions"

A dedicated DM panel.

The ability to change font size. ( big one for me )

The ability to use all of the features native to the web client such as "edit".

The ability to copy text to allow for the Iphones translation menu.

I'm sure there are more but I think this is a good list to start with.