I found a new function (at least to me) today. This would be for at least all 2008 300C with this software revision (this would be the revision you get after the ACC 'blinded' fix:

When you are in the now-active digital speedometer, if you press and hold the 'sideways' triangle for about five seconds, you will get the 'Top Speed' display. If you press the sideways triangle again, it resets the current high speed; if you press and hold the sideways triangle for about five seconds again, it turns the display off.
Hope y'all enjoy (and sorry if this has been reported before).
Dechief
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