Sorry for not responding to this sooner. I seriously thought I did respond but apparently not.
We've decided to include SuperFlexi in the core. We're doing this because it provides a very simple way for developers to create things like page banner sliders, icon blocks, image galleries and a whole lot of other things. We're in the middle of developing several new skins for the mojoSkins project and each of these skins will require SuperFlexi. We really think it would be best for all users of mojoPortal if SuperFlexi is a core feature.
You already noticed the banner on the demo site uses SuperFlexi but if you look at the product demos page on the demo site, you'll see a grid of products. That grid is generated with SuperFlexi.
The next release of mojoPortal is in the next couple of weeks.