Abuse in statistics usually involves selective use of absolute numbers vs. percentage.
Example: "This is the biggest ever..." things that grow over time will always be bigger in absolute numbers ("biggest tax increase ever"). When often times a percentage is more appropriate.
As for the poll results -- You can't just take out the boot screen votes and pretend the others would have remained roughly equal. Those boot screen voters would have likely voted for something else and I suspect by and large they would not have voted for Rainlendar but rather IE toolbars or "Somethign else". Whereas specific apps like Trillian and Rainlendar have specific constituencies.
Which brings us right back to the beginning: I think Rainlendar is a good program. But I don't think it has yet reached the level of popularity to earn a section. But hopefully, in time, it will continue to gain popularity and at that point it will have a section.
From WC's point of view, the point of a section is to attract new people to WinCustomize. That is the #1 criteria.