Thanks Adam B. for the update.
I will checkout your modded src.
The first thing I changed was the default font. I don't like DejaVu Sans.
URW Bookman L looks much better, but tastes differ.
The information lives here: /mnt/settings/.FBReader/ui.xml
Code:
<?xml version="1.0" encoding="UTF-8"?>
<config>
<group name="Indicator">
<group name="InfoDialog">
<group name="Options">
<group name="OptionsDialog">
<group name="Style">
<option name="Base:fontFamily" value="URW Bookman L"/>
<option name="Base:fontSize" value="12"/>
<option name="Base:lineSpacingPercent" value="150"/>
</group>
</config>