Just wanted to let anyone know that reads this forum looking for inversion on the mark 5 aura (non - hd) that cool reader does work and does invert the screen.
I tried version 1.2.6.23 out on the Aura (non-hd) and it works great. I will admit the menus are not amazing but get the job done. Swiping doesn't seem to work and the footer doesn't have options in the list (unlike the header) but I prefer nothing in the margins. I can't seem to find a way to figure out where you are at percentage wise though without turning on the header or bookmarking and then looking at the bookmarks. Any suggestions? I know I'm picky.
Edit: I just added a long press at the center bottom to toggle the header that seems to work for figuring out my percentage.
Now my only new problem is localization of the percentage to US (we have a period not a comma) I'll read through here and see if anyone figured that out but a quick google search has someone asking it back in 2012 so I'm guessing it was fixed in some areas just not in others or something.