Seriously, I'm glad you like the extension mechanism. I'm not convinced that it's "elegant" in a large software engineering sence -- it should use normal Perl objects. But I think this is handy in reducing the amount of work that needs to be done, and avoiding the need to put more than one package in a file. So it's "elegant" in some other sence of the word, like a perl -e line that lets you replace a whole program with a one-liner.