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Control Duration fields (Whole Number field with a Format=Duration) to present in either Hours or Minutes
Currently, duration fields will present inconsistently in either minutes or fractions of hours. Screenshots below show how the same field with the same value is presented differently across different forms and views.
I have heard that the logic is to convert in hours as long as you use 15 minutes steps, but in my example that is clearly not the case. And even if it did, a consistent presentation regardless of the duration is desired. With Duration fields being used heavily in D365 Field Service, this is very confusing to users.
The ask here is to provide a control that would allow a global setting to either present in hours or minutes. Or possibly to have one control that presents in minutes and another that presents in hours.

Add N:N Relationships like a multi-select optionset
The idea would be create a better "multi-select" optionset. The control could show all available values, and the user could pick which ones but just clicking the dots, the backend would make the N:N link. Obviously would not work for large datasets.

Read-only grid with Group By functionality
One of the great features of the out-of-the-box Editable Grid is the 'Group By' functionality.
It would be great to have the same functionality for read-only grids as well. Often it is not desirable to use Editable Grids, but the 'Group By' still having the Group By feature available would be great.

drag and stream lane view
Not sure if this has been done already but it would be really useful to have a drag and drop stream lane PCF that allows users to drag opps or cases from one stage to another.

Control for Rollup fields that does not include the "last updated" date field
The standard control for Rollup fields includes both the rollup field and the Last updated date field. In many scenarios the last updated field in irellevant and only confuses the user. So it would be nice to have a control that just shows the actual rollup field.

Copy and paste screenshots directly into composed email
It's something alot of people have wanted for a while but the ability to directly copy a image from a screenshot on your computer and paste it into the body of the email content and have it display contextually. Obviously it need to auto-attach the screenshot as an attachment first before displaying it contextually.

Subgrid with Re-ordering of Child Records
I imagine this would only work for 1:N relationships with a whole number column on which the selected View is sorted on. The grid would allow either drag and drop re-ordering (or at least up/down arrows on each row) that re-orders the records via updating the whole number field.
In my case we are building out some data (legal Clauses) to insert into documents and the order of insertion matters. I'd build it myself but at this time at least the Project doesn't have budget for me to learn how to build a custom control and build/test it.

Advanced find control to embed in forms
A control to create dynamic FetchXML queries and show results in a supported way. Aditionally could save que query as SQL as savedqueries or userqueries.

Display Dataverse audit history in a canvas app
If audit logging is turned on for a Dataverse table you can view which fields were changed and what they were changed to or from. This can be added as a standard tab in a Model driven app. This can't be added in a canvas app, just showing the rows from the Audit table gives includes AttributeMask field that is a comma separated list of column number and data, which even the docs say not to use.
MS Docs: Retrieve the history of audited data changes - Power Apps | Microsoft Learn

password field
ability to show/hide password fields with an 'eye' icon. Passwords must not be visible in HTML source code.
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