Filter order for 3rd party modules?

[Brian Pane]

I have a module that needs to install a filter to run after the SSI
filter.  My current solution is to parse and modify
$HTTP_FILTER_MODULES in my module's config script.  That's a hack,
though.  Is there a cleaner way to insert a 3rd party module to run at
a specific point in the middle of the core filter chain?

Thanks,
-Brian