Thanks. 
AllowPrivateAccess was never documented and hence why it got missed. I will add it in short order immediately!
And that’s not a bad suggestion for the text formatting really. Personally I would prefer the tool to format the text for me, so I think I can leave that as an option when I get around to making a new options dialog page. I will surely keep this in mind. But I do think I have a way to preserve the text so expect to see that in the future.
Whole file and/or project refactoring/editing is a good idea! I can imagine scenarios, too, where one might put down a bunch of empty tags in a file with similar-purpose data (perhaps for example a BP Function Library) and quickly apply the same tags to all of them in one quick edit. This will take quite some time to develop though, so it will probably have to be on the back burner for the time being.
The order apparently does not matter a whole lot, as code in the Unreal Header Tool just parses through the entire parameter list of the macro to do its work. You actually can edit the order yourself in the options page for the tool (Tools -> Options -> Specifier Editor -> Specifier Editor Settings) but the changes will not save properly since I do not think I implemented the configuration correctly. I plan to correct that (and of course, expand on it) as one of my next things after text scanning improvements and such.