I’m refining the behaviour of the DrRacket UI plug-in part of the language for my introductory programming course, but would like to turn a lot of the UI parts into separate packages that would have broader independent interest. In particular, the plug-in prevents students accidentally wandering into the Interactions area before the current prompt (e.g. with the up-arrow key). Does anyone use the ability to move before the prompt, and for what reason? Two uses I can imagine : • shift-select-copy earlier expressions or output • press enter when in an earlier entered expression to copy it down to the prompt (is anyone even aware that that behaviour exists?)

I use both rarely, the second one even more rarely and i could do without it.