Today, I did some user testing for the 3.8 beta when teaching the argparse module.  The new "Run Customized" option needs two usability tweaks.  1) Move the menu option up by one so that the regular F5 "run" is last -- learners we having a hard time finding and mouse targeting the more commonly used regular "run" option.  2)  The text input widget should be pre-populated with the most recently run command-line.  This makes it easier to test variants of the same command rather retyping it on every invocation.  Even more desirable would be to have a multi-command history, but in the absence of that an editable single command history would suffice.