Do you mean something like this?

- reversed path.png (13.13 KiB) Viewed 5307 times
Very easy.
First, make sure your circle converted to a path. You can do this by going to the Objects menu and select "Convert to Path."
Then with the path selected you want to reverse it. Again go to the Objects Menu, under "Edit" select "Reverse Path."
Usually, this will make the text curve along the inside of the circle. So what we want to do is when adding the text we want to add an Offset with a negative value. I used an offset of -26 for the image above.
If you want text moving in both directions that's a little trickier. You need two paths moving in opposite directions to pull that one off. But it all works.