Being able to move the marker is a massive improvement, so I give back three of the four stars I had taken away.

I'll bring my review to 5 stars if you can provide an icon, or some way to quickly disable/enable without opening the Add-ons tab (maybe in the context menu?).

I also have two suggestions:
First, you should get someone to improve the desciption/ instructions that appear in the Details and Opions windows on the Add-ons tab.

Second, either double the thickness of the lines drawing the marker arrow, or provide options for the marker. It's sort of difficult to click on right now without perfect eye-sight.

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In response to your reply:
I had nothing on the toolbar, the icon disappeared when you added the plus to the name. I just tried the customize screen again twice. And after closing it the second time, the icon appeared on the toolbar. (I did nothing but open/close the screen. Seems like that is not your problem!

Oh, and it's not the size of the marker, just the visibility, its too thin for my taste - but it works - so just a suggestion for lines to be heavier.

So I'm a VERY happy user again!
Thanks!