Does it matter? One should be able to modify an open-source browser to do whatever they want, within reason.
This is entirely within reason.
I have Opera setup the same way, makes reading pages faster. I've also disabled the scroll-bars in Opera so that I have that much more screen real-estate and can display more text. It's the perfect mobile browser for me since I don't tend to use many sites that would need me to jump over to the micro-b engine.
Operaa also tends to render pages faster than the current micro-b browser.
Once micro-b comes up to par with Opera in page rendering speed then I'll probably look at switching.