There is more than one way to add a morph to a world: front, back, in layer, before, after, etc. Might be a lot of extra methods that would rarely be used.

I'm talking my way into adding something like this to Trunk.  But, shouldn't we just addMorph: to project, instead of looking at its world to add it there?  Yes, it doesn't support this yet, but shouldn't it with appropriate encapsulation?