while tab works fine for cycling through fields/buttons, shift-tab doesn't go through them in the reverse order, just the same order (would be nice to have shift-tab) I've checked this behavior on most of the screens and it seems to exist on all checked
Try ALT-TAB, as that should work for you.
Works great! Any chance shift-tab could do it to? :)
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alt-tab works as you want shift-tab to, and the bottom line of the screen mentions this standard vt100 consoles (such as the linux console) don't return a unique keycode for alt-tab