It would be nice to have colors depending on the value of a field for example : 

Green color : open status

Red color : closed status 

Something similar to pcf gallery. 

It would be great if we could get a PCF that turns a multiple lines of text field into a drag and drop HTML editor using a open source html editor like GrapeJS.

https://github.com/artf/grapesjs

A much requested item is a rich text editor in Dynamics CRM. You can already find some RTE experiments via CCF on the web.

Ideally, we would have a RTE that stores data as richt text (html) but also as plain text. This way, the info can be used to show in views and can be used in Excel exports or reports as well.

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.

Handling Queue Items is quite frustrating and requires a lot of clicks - an easy way to move Queue Items from Queue to Work or another Queue would be helpful. Maybe like a kanban board. 

There is already a multi-select-control for n:m-relations, but none for a "connection". The benefit would be to be able to add connections in the quick-create dialog (which does not support grids)

It would be great to convert a grid view of records with child and parent relationships to a folder view.

I saw PCF for the note attachment but a good idea could be the same for email attachment files.