Yes, it makes sense.
I did not used ePub yet. I will wait for PRS+ 1.02 so that I can change font for ePub because default font don't display Central European characters that I need. So I didn't yet see how ePub indexes number of pages at the bottom. Well...LRF system of indexing has more sense, at least to me, number of pages is changed depending on the font size.
I am new user and for what I see LRF is very nice, I will finish current book in LRF and read next in ePub so that I can see the difference. If I am not mistaken many users here prefer LRF over ePub.
As for the battery, I just have USB cable, but I will try to find PSP adapter because it is highly recommended here on forum