Touch select input
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Holding the left back trigger in handheld mode activates select for the D-Pad (as holding shift on a computer would), but not for touch input. However, once beginning selection by moving the cursor with the D-Pad, touch input continues to change selection after letting go of the left back trigger, until D-Pad or right back trigger input. (Right back trigger appears to work with touch input until let go.)
Having the cursor on the top 2 (occasionally 3) lines results in losing the ability to tap other lines, and a touch-scrolling lock that scrolls back upwards. Right stick input fixes this.
Edit: Touch-scrolling and hovering over a top key for long enough results in repeated input of key and ignores scrolling behavior while drag remains above keyboard