key repeat "speed" should be relabeled
The current UI for adjusting the key repeat "speed" is counterintuitive. "Speed" communicates the "how fast" the repeat action should occur, while the implementation seems to adjust the "interval" Thus, you get a "faster" key repeat with a "lower" setting.
The confusion is reflected in this askubuntu answer. Although the question is specific to Ubuntu, the problem applies to Gnome generally.
Simply changing the label to "repeat interval" (or some such) seems like the most straight-forward solution to the problem.