On the UA string:
Think the compatible and IE8.0 bits aren't necessary - try the Firefox mobile UA string without the "Fennec" bit but with "Opera" instead. Any good? I find the edited Fennec string works for most things in microB.

General feedback:
Getting to really like it as a general browser. Seriously quick. A few liveable-with bugs like funny behaviour when using textareas (e.g. now!) but nothing drastic.
Main to need to use another browser is absence of video - doesn't have to be flash but more html5 would be nice. Unfortunately when I tried youtube's html5 test, all parts failed - did I have the settings incorrect? There's no tablet linux armv7l version that could be run in EasyDebian, is there? I could only see desktop versions.

Good job getting Opera on Maemo. Long may it continue! Thank you.