Again, thanks for all of you for posting your opinions about that issue! I really appreciate it.
Personally, I also think that using "Starling" as prefix (or suffix) would be too verbose, even with modern IDEs in mind. So, if I add a prefix, it will most probably be "ST" or "St". But I still don't like it. *g*.
Any more ideas? Perhaps something completely different ("Container" instead of "Sprite", "View" instead of "DisplayObject"? Or only "S" (SSprite, SDisplayObject)? I try to think outside the box, but nothing overly creative comes to my mind *g*.
Thomas, your remark about the rotation property is, of course, right: it seems odd at first sight to change that from degree to radian. Different to what Thibault's description suggests, using radian was not only done to have consistency with Sparrow (that was a reason, too, of course), but to have consistency within Flash. The Flash API is not consistent itself on whether to use degrees or radians. Native DisplayObjects use degrees, Point and Matrix use radians. So you constantly have to convert between those 2. When you use Starling (or Sparrow), you don't have to: you can use radians all the time, period.
(Well, except for Matrix3D, which, as I found out later, uses degrees. *sigh*.)
That's the reason for that choice! I know, some might have decided differently, but I thought consistency would be the key.