3: can the fonts be changed on the w910i? If yes, how?

Yes,you can.Just edit the file "fonts.xml" like this
<font source="/tpa/preset/system/fonts/font.ttf" />
<font style="bold" source="/tpa/preset/system/fonts/font.ttf" />
<font style="italic" source="/tpa/preset/system/fonts/font.ttf" />
<font style="bold;italic" source="/tpa/preset/system/fonts/font.ttf" />
and flash it back with your TTF font file.