[typo] How to modularize feed autodiscovery?

[Paul R Brown]

Hello, All --

I wrote a simple Feedburner sidebar for Typo in about fifteen minutes  
-- kudos to the designer of the sidebar API.  However, sidebars don't  
have the ability to influence some of the core aspects of typo, e.g.,  
how autodiscovery feed URLs are set.  I'd like the plugin to be able  
to set the autodiscovery feed URL (in /html/head/link 
[@type='application/atom+xml']/@href, for example).

Any thoughts about how this could be accomplished within typo and  
with minimal disturbance?

-- Paul