There are some ideas to do compositions of sprites, but they are too complex.
The “Repeat Cels” option can be easily be done (it’s like executing Frame > Duplicate Linked Cels on a continuous layer several times).
The extra continuous method looks like a nice idea too, a little more complex, but I like it in the sense that it only modifies the “new frame” command/etc behavior (the sprite/.aseprite file still can be saved exactly in the same way).