ixtab, i've seen some more manifest entries in your xml:
<!-- FW 5.0.* -->
<attribute name="Toolbar-Style" value="none"/>
<!-- FW 5.1.* -->
<attribute name="Toolbar-Mode" value="persistent"/>
<attribute name="Font-Size-Mode" value="point"/>
Do you have any more info on those? Most of the fonts in my kindlet are really huge now, and i suspect that the font-size-mode might help with that, but setting it to "point" didn't help at all.