Thanks for the kind words and the suggestions!

For (1), I'm not quite sure what you mean—you have the option to close or keep any tab that you stash based on wither your are holding the Alt/Option key. Would you mind opening a feature request on GitHub so we can discuss further? [see below for link]

(2) should be fixed as of Tab Stash 2.4, just released. Apologies for the inconvenience!

(3) Thanks for the suggestion, I've made a note of it to consider for a future release!

(4) You can do this today—if you open the stash list (right click on the Tab Stash toolbar icon and choose one of the "Show Stashed Tabs ..." options), each group will have a set of blue buttons for stashing all tabs/the current tab into that group. Just click the blue button for the group that you want and your tabs will be saved there.

Here is the link to open a feature request: https://github.com/josh-berry/tab-stash/issues/new?template=feature_request.md