The Bulk Edit Memo Toolkit setting adds the ability to edit the memos for multiple transactions at once. Select two or more transactions then open the Edit menu and choose Edit Memos.
This is one of those settings that I didn’t realize I needed until it was added to the Toolkit. Now my imagination is running amok with situations where it would come in handy. I make liberal use of the memo field and over the years have developed some ninja-level Memo Field Hacks (such as how to use emoji in memos).