Add These Features
Faster way to delete emails from the same sender while organizing the emails from the same sender
Lister & Unlister
A better way to say a email contact can send or not send a email to you
Automatically update when the individual changes numbers or names
Thank you for your feedback on features!
With Email Stacks are you referring to Conversation v. Individual mode? If so you can definitely change this under your Desktop Settings.
You can also Sort By Sender already! From your Inbox, you'll see a drop down "Sort" in the top, right-hand side!