No.  ScrollView's CSS ([src](https://raw.github.com/yui/yui3/master/src/scrollview/assets/scrollview-base/scrollview-base-core.css)) is very light and doesn't require any specific DOM structure, it just allows scrolling of whatever overflow content is inside.  Would be heavy-handed to assign layout styles to the content.  

It might make specific implementations easier (in this case, horizontal `li`s), but that's only one use-case.  The `scrollview-list` module is an example of one that helps out with vertical lists of content.