Weโre hoping to continue to improve the cell editor workflow, to make it more and more comfortable: Auto-splitting of multiple expressions would be nice, but even a better error message telling you where you can split your multiple statements would be a good place to start.
In a similar fashion, weโre also planning on auto-deleting empty cells when you blur them, and move to focus a different cell. That should help avoid * | undefined from cluttering up your notebooks.