Thanks a lot, as for the question,
Yes. I had consider it. There are a few users that sent me some feedback on this.
Sometimes the way you design certain feature may prevent you to be able to add some other simple features like you describe.
The addon let's you open tabs from multiple sessions. And I have no good solution for tracking which tab came from which session (and it's pretty had to implement one as well). My point is... if you want replace the current session, do you want to save the "session" that will be closed automatically ? Because if you don't then I can do that pretty easy. But if you do want that... then I have no idea what tab and where I should save... Can't replace the session, can't save them as a new session... i can't seem to find a good solution for this. Also, what happens if you have multiple windows, and so on.
Truth is.. you can take 2 people and ask them how do they see a certain feature and chances are they won't expect the same outcome because each individual person has it's own way of interacting with windows/tabs and the concept of session my be different, etc. Any new feature I add I have to think about how exactly I can cover most of the use cases and sometimes it's not really easy to do that.
My solution for this is basically... I will try provide to multiple possible solution but I need to first implement a configurable toolbar so that people can hide buttons that will never want to use or use extremely rarely, and have those be available in a hidden dropdown list to the right of the toolbar.
Thanks as well.