I'd like to ask that bundlebuilder.py keep the main routine in 
its original location with respect to whatever package it 
appears in, i.e. if the app's main is
MyPgk/Main.py

then the code is put in MyPkg:
Contents/Resources/Modules.zip
      /MyPkg/Main.py

or if no zipping is done:
Contents/Resources/MyPkg/Main.py

I fear this may be too difficult to be worth the work, but I 
wasn't sure and felt it better to ask.

The issue is (as in my 2 previous bundlebuilder requests) 
making it easier to write cross-platform code. If one carefully 
develops code for Mac then one can easily organize it such 
that it fits perfectly within bundlebuilder's assumptions.

But in my case I wrote code to run under unix first, then 
tried to get a working double-clickable Mac app, and it was a 
a surprising amount of work. Among other things, I had to 
rewrite my Main.py so it could be moved relative to its 
package (not a really big deal, but surprising). The other 
requests would simplify or eliminate cleanup work I do after 
the bundle is built.