Under Windows 7, if a touch screen is detected, all widgets that are children of a scroll area (and that often means a majority of widgets in an application), are native rather than alien. This reduces drawing performances and causes flickering when resizing a large/complex UI. Can this be fixed someday?
Aliens were in my eyes a major achievement of 4.4, and since there are more and more touch screens, the current Gesture implementation puts a shade on that.
At least, Gestures could be switchable programmatically to leave the final choice to the user (rather than requiring a Qt rebuilding with "no gesture").

I am aware of QTBUG-6007 but I don't see a link to a new issue mentioned in the last comment.