[Instantrails-users] Retaining non-Rails customization over upgrades

[DeeJay]

Suppose I want to make an Instant Rails installation my ONLY
installation of Ruby.

Suppose I've got personal customizations to the ../ruby directory
tree - installed RubyGems, added .so libraries, tweaked
testrunners in Test::Unit, etc.

How would I go about rolling over those changes from one release
of Instant Rails to the next as automatically and elegantly as
possible?

Thanks -

 DeeJay, Leicester, UK