I understand that your goal was to get Thunderbird on Android CELL PHONES (with very limited screen size) but I want it on my Fire Max 11 Tablet. Clearly more screen size ! So I would like it to look more like the traditional Thunderbird with multiple columns.
1st column for accounts and folders. Then multiple, sortable columns for Threading, Star, Attachments, Subject, Correspondents and Date. Add/delete columns as the user wishes.
If this customization is available, I have not found it yet.