How about merging the two object types, and maybe change the name so people new to Construct would understand that it may be usable both for Sprites as for Tiled Backgrounds?
I think that is a more elegant solution than keep a redundant object, although it will take a lot of work, because all of the learning material use Sprites and Tiled Backgrounds as very different plugins(as they really are today).
I don`t know, something like "Animated Image", or "Tileable Sprite"...