I filed #7 and #12 for arrow navigation. #7 was addressed in PR #63, but my suggestion in #7 was to use hidden <input type="radio">s (because of built-in keyboard accessibility). When a row is selected (i.e., its child radio field is checked), you can go up/down or left/right, and you can cycle through the rows/fields as expected.

The two issues that stick out for me are that the keyboard navigation waits for keyup (instead of radio's keypress) and that you can loop through forward/backward from the top/bottom of the list with radios.