First of all, I also have the Note 2, and the easiest thing to do is have the app on the main storage and then just set your eBook folder to be on your extSdCard folder, which is your actual external SD card. Hope that helps.
ALSO...Have you noticed that images in your eBooks don't seem to work? I just a see a blue "?" where the image should be, which stinks as embedded images were one of the last things that Reveal still had over many of the other readers.
Have you noticed that too or is it just me? Maybe there's a fix for that?