I haven't done any customization on my Kindle (Kindle Keyboard, though what I'm going to say is true universally). Since it natively comes with the ability to open images -it's a hidden function though, look it up if you need to-, I upload manga and light novel scans and read them during my commute. I run them through Mangle to reduce the whitespace, dither, and to cut the resolution if too large. A flaw of this approach is that images aren't text, so I can't copy words I don't understand - for this reason, I never bothered with dictionaries for my device.
Offtopic, but as my Kindle's currently unavailable, I got a cheap tablet to play visual novels on - tons of fun. I'm going through Higurashi, since it's SFW, long, and easy to run on a tablet.
Offtopic, but as my Kindle's currently unavailable, I got a cheap tablet to play visual novels on - tons of fun. I'm going through Higurashi, since it's SFW, long, and easy to run on a tablet.