Sometimes I prefer to over-size conduit for various reasons. However, if this is done manually at the panel level and then the feeder / ampacity changes, its very easy to have a feeder that exceeds 40% fill. Proving an option to adjust the maximum fill from 40% would allow the user to over-size conduits without manually selecting a size.

Also, adding an alert that warns you when a feeder exceeds 40% (Similar to the panel threshold warning) would be a great add.