[plt-scheme] Can subclasses of editor-snips% be saved?

> The danger here is that the user-space program may end up with instances 
> of the `my-editor-snip%' class as created in DrScheme's space.

Yes, I'm seeing this behavior.  Ugh.



> In the past, we've hacked DrScheme by explicitly attaching modules like 
> "my-editor-snip.ss" from the DrScheme space to the user space; see 
> `to-be-copied-module-specs' in `drscheme/private/eval'. As far as I 
> know, that's still the only solution.

Is there an prefered extension mechanism from the tool's end that lets me 
attach more modules to this to-be-copied-module-specs list?  I believe I 
should be looking at drscheme:language:extend-language-interface and do 
the same sort of hackery that the lang/htdp-langs.ss module does with 
on-execute.  I just want to make sure that this is an acceptable place to 
do the namespace-attach-module stuff.