I have no idea why nobody mentions that copy&paste in forms isn't implemented.

It's of little use for me without that.

That's because copy/paste in web forms is implemented. It was fixed after beta 5, but before release candidate 1: https://bugzilla.mozilla.org/show_bug.cgi?id=611741

There's a text reflow option in the preferences.

I saw it and activated it, without any tangible effect. And reflow is probably the single most useful feature of a mobile browser.

Reflow currently takes effect only when you double-tap, not when you pinch zoom (just like some versions of the stock Android browser). The reflow is still a work in progress, which is why it's disabled by default - we have some improvements planned for future versions.