Solo Ad? You mean one ad only? WHY would there be a NEED for a section for those of us that ONLY WANT TO ADVERTISE ONCE instead of using multiple ads? Unless YOU can justify the time and expense for a section that would be SELDOM used, I think DP would be crazy to add such a section.
Solo ad is a traffic generation technique. It involves buying clicks from a solo ad vendor. Solo ad vendors build huge lists in specific niches. When you hire their service for a solo ad the vendors email their list - either with your copy or they create copy tailored toward your offer. These may or may not be highly targeted clicks. There are some unscrupulous vendors out there who pay a fraction of the click income to people just for them to click on their emails. So you have to know who you're dealing with. There are also many legitimate vendors who deliver on the clicks they sell. I don't know if a solo section is warranted without knowing why Elvis wants one.
Why not list it here: https://forums.digitalpoint.com/forums/traffic.99/ ? Seem like it's more fitting than the Pay Per Click Advertising category.