i find myself using the format string widget quite often. It offers a lot of nice functionality - https://appstore.home.mendix.com/link/app/264/Mendix/Format-String
One minor thing that i would love to see is the ability to show a progress bar when a microflow is invoked.
The options can be the same as when calling a microflow from a button
EDIT: The idea is already implemented and awaiting for a merge - https://github.com/mendix/FormatString/pull/25/files