I started porting the Coolreader to my PB302.
It is not finished yet, but it can display books.
This is pretty much beta software so don't be surprised if it crashes often.
Get the zip from this post
and unzip it.
Move cr3.app to /system/bin/
Move crengine/ to /system/share
Add cr3.app to epub and fb2 in /system/config/extentions.cfg
Now you should be able to read books with the Coolreader.
The keymapping is made for the PB302 but you can change it in crengine/keymaps/keymaps.ini
E.g. for the PB360 replace KEY_PREV / KEY_NEXT with KEY_UP / KEY_DOWN (probably, I can't test this) and so on.
It is possible to map two keys to the same action:
KEY_PLUS = DCMD_PAGEDOWN
KEY_DOWN = DCMD_PAGEDOWN
Only parts of the menu work so far. You get there with the power-key
Navigation is with the left keys Enter with the right. OK is the power key, ESC the round Back-key.
And there is no support for the touchscreen so far...