Hi erwtruck,
I recently answered a post related to adding the account details when printing checks. Currently, the option to show them is not available. And, you're on the right track about adding them temporarily in the Memo field.
I'll personally send your feedback to our development team about this. I also encourage you to send yours as well. Please click on the Gear icon and select Feedback.
Post your thoughts or questions here, and we'll help you.