It just occurred to me that since 64th and 128th notes are rarely used, I could reassign the numbers 1 and 2 to “Decrease/Increase Rhythmic Grid Resolution”. This works really well, especially when using the (wonderful) shortcut option-shift left/right arrow (Mac) to shorten or lengthen note durations.
In fact I think it’s such a good idea, the Dorico team might want to consider making 1 and 2 the default rhythmic grid shortcuts - they are on the same row of the keyboard as all the other rhythm values, and they are much easier to remember than the built-in shortcut (which I’ve already forgotten). And easily changing the rhythmic grid can make input and editing much faster.
Just a suggestion - Merry Christmas, happy holidays and congrats to the Dorico team on getting 1.0.20 out the door!