John Gilmore writes:

The last thing PGP needs is an installed base of Mac users who are always stuck three revs back because they forked off their own wierd version and couldn't upgrade when the rest of us do.

This was why I proposed the internal "engine" concept where I keep the machine independent code intact and the GUI seperate. At the moment, I can't think of a better idea. So perhaps you can give us some suggestions towards a solution to the problem, John!