Allow locking of the normal transform orientation.
When locked, the normal transform orientation will not change when you select different things until unlocked. This is very useful so that you don't fill up with new transform orientations when you want to align things to neither the local nor the global XYZ axis. A possible hotkey is <kbd>Ctrl+Shift+Space</kbd>, one very similar to that for adding a new orientation (<kbd>Ctrl+Alt+Space</kbd>)
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I see a pretty big potential for users to have this enabled/activated accidentally. Is there a way to make it more obvious that the transform orientation has been locked? Also, why just the Normal orientation? Why not Local as well (for multiple selections in Object mode)?