A new coolreader firmware is out for v3+ from what I could understand in the russian forum now it also supports doc, mobi and pdb formats.
v3+ full flash
http://files.mail.ru/B6IT4W
v3+ crengine only
http://files.mail.ru/7YOX0U
I only have the v3ext so have not tried it you can see all the things added
in the crengine commit log
http://crengine.git.sourceforge.net/...ine;a=shortlog