[Bob Williams]

I've been running into this as well and have been meaning to report it.

I see this, actually, as an interesting UI dilemma. The crux of the dilemma is that the same keyboard controls are used to scroll the page as are used to change the value of form controls. When it's not clear whether focus should go to a control or to the whole page, where should it go? There are a variety of options (none of which includes showing a menu outside the window ;), although one option might be to scroll the window back up to show a control which has focus), and I'll bet some folks would view each of them as ideal.

Do Apple's accessibility UI guidelines address this?