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I can certainly understand how an ability to add an option for Memo/Description to your Sales by Customer reports could be useful and have submitted a suggestion about it as of today.
You can also submit your own feature requests while signed in.
Here's how:

Your feedback's definitely valuable to Intuit. It will be reviewed by our Product Development team and considered in future updates. You can stay up-to-date with the latest news about your product by reviewing Intuit's Product Updates webpage.
For the time being, on your Sales by Customer Detail reports, you have an option to turn on a column for Client/Vendor Message.

I've also included a detailed resource about working with reports which may come in handy moving forward: Run a report
Please feel welcome to send a reply if there's any additional questions. Have a wonderful Thursday!