Lately I've gotten ATC instructions to "cross XYZZY at 6000", and have gone into the Flight Plan to make that adjustment so that I can get a VSR instrument to help guide my descent.
Every. Single. Time, I pop up the dialog to change the waypoint altitude, and start typing the value I want to change it to, then look up to notice that the altitude field now reads something like "30006".
So then I mutter under my breath, press "Clear", re-type "6000", and then press enter.
I recommend this dialog pop up with the altitude value highlighted so that it will be overwritten when the user starts typing in the new value, so that the user does not have to press "Clear" first.