1. will be fixed
2. It's a lot of complication for very little gain. It can only be grayed out when the cursor is actually at the word. So its enabled/disabled state would need to be conditional on cursor position in the editor, not just the number of words.
3. is not worth the effort. For reasons I outlined in my previous post, undo-ing the last change without a rescan is a lot more work to implement than it would seem
4. Will be fixed -- although deleting words is not within a spell checkers design goals.
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