Also stay in the loop with what's going on through these awesome links:
The Memo / Note field submitted via the API accepts "\n" characters, but in MX Merchant the line breaks are not translated to <br/> tags. The field is the only one that can juggle important data between a custom application and the MX Merchant backend, which might be reviewing transactions outside of the application. Currently the field is difficult to read because the line breaks are discarded.
Why is this idea resolved as "Won't Do"? The field output can easily be displayed with line breaks preserved using the CSS white-space property. Seems like a very simple improvement for something that could be interpreted as a bug with the user.