you would be able to go to subdirs (only) inside the locked tab but when you pressed CTRL+\, it would transfer you to the directory you were in when the tab was locked. Perhaps this could be a new feature called "root-lock selected tab".
Thank you Wanderer. I fully endorse this proposed feature.
It is gratifying that I am not the only one who finds the new tab behavior peculiar. I keep having to close unwanted tabs in order not to completely overwhelm the interface.
Tabs need several new properties/options, all of which should be accessible from a tab properties dialog for each tab.
Fixed name (no matter where the tab points).
Toggle for lock navigate "up"
Toggle for lock navigate "down"
Toggle for delete (or hide?) tab if location not present and/or
Toggle and value for default location to use if tab's initial location is missing.
Exposed/editable mask in properties dialog value saved with tab.
Toggle to "restore tab properties upon tab activation" (or not)
Toggle to "automatically save tab properties on exit TC or load new tab file" or not.
I fully realize that a lot of effort and thinking went into the design of the tab behavior, and I am trying to change my work habits to fit the current design, it's just that I have not yet identified an advantage to me for the current behavior over what I was hoping for.