Found and testing this:
"EBook reader & Free epub books"
https://play.google.com/store/apps/d...d.reader&hl=it
A very good epub reader app ( still don't know other formats but i read quite exclusively epub) forked from CR3.
It permits lots of customizations, works well in T68, should permit[1] interactions with several dictionaries eccecc.
Also fonts confi is fully supported.
Last but not least, t's a GNU-GPL'd app...
Some annoyings:
* the cover is not 100% screen displayed ( already emailed to the developer for this but i think it can be done by EBR's internal CSS - perhaps rooting needed but i've to investigate);
* in the first run, interface is in a woody flavour, not so good for eink devices ( oK, good for android tablets and phones ;-) but it's easy to change in a most white theme and is possible to use owner's tile, installing a jpg in /SDcard/.CR3 folder.
* strange behaviour of the right buttons: their funcions result inverted ( bottom go back and vice-versa) but i think it can be fixed
using menu configuration for "Volume buttons".
[1] Still not installed and tested any dicts but it's specified in the google-play page of the app.
...to be continued
HP