I've always animated at 30fps, so 3x "super" or big nudges (i.e. cmd/opt + shift + arrow keys) has always equaled 1 second, as super nudges are 10 frames.
Recently I've begun animating at 24fps, so now 3x super nudges is 1 ¼ seconds. It would be great if we could adjust the value of a super nudge to be whatever we want, or at the very least step it down to 8 or up to 12 frames.