Every time I update a post, I have to retype the tags for the post. Why doesn't TextNut remember the tags already used for a published post? And, as an additional request, TextNut should remember all the tags already used in a blog and present them for selection as blogger does.
For single post tag, I recommend using tag markup in document itself, e.g.
+tag1+ or +tag2, tag3+
When post to blogger, tags will be extracted and removed from main content.
For all tags, that could be improved in future.