[otnt]

If using MobileSheets for practicing pieces, not performing, it would be very useful if "Last Open Date" would be stored and than used for ordering.

It could be useful for a "New pieces" setlist, if you are working on several new pieces, but especially for "Maintaining repertoire" setlists. You open a setlist and see which piece is neglected and on which you have worked recently.

It would just get one single new data field in the database and would not increase data volume a lot, I think. "Recently opened files" is a standard feature for almost any application. In my opinion it's a must have.

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[This functionality could be increased further, but would mean a lot of work and new data fields.
You could store all dates of document opening and even how long it was opened. Than queries like "How long I worked on a piece X/setlist Y in the last month". And so on. It would be a practicing log. Maybe you could even track short commentaries and than later see a complete practice history of a piece (Day 1: Worked 20 min. on bars 1-4, problems with dynamics, Day 2: ..)
For me it would be not realy essential but very nice to have and maybe also interesting for other users, who use MobileSheets for practicing and not performing. But it would be very difficult to implement. And it should definitely be optional - "Advanced Usage Tracking - yes/no" for people who would like to keep the database minimal. ]

Go to: Settings -> Library Settings -> Tab Selection and Order
Over there make sure you select "Recent" from Available tabs.
Enjoy.
This feature is in MSPro for quite some time.

Not sure how useful would be "How long I worked on a piece X/setlist Y in the last month". It should rather read "How well I worked on a piece" (in terms of focus, speed, precision).
One can spend years on some piece and will never be able to perform it.

For the commentaries you could use annotations/layers which you could rename by a date/days. You can easily sort these and hide/unhide them.

It is already available for you.