Token or similar support?

surge_martin: Can you tell me exactly what you'd like to do? Because you mentioned the Pathauto and Taxonomy modules, I suspect you want to do something along the lines of creating an RSS feed for each taxonomy term when viewing that term's list of posts. The Taxonomy module handles this behavior natively, and you can configure the Pathauto module to provide aliased paths to those feeds.

To address your second point:

This is also complicated by the fact that pathauto prefers to use hyphens as a separator, but Drupal seems to prefer a plus, at least for Taxonomy term names. Perhaps a means of using the ID instead would make it easier.

Pathauto will use whatever separator you assign it. By default, this is a hyphen.

I have forgotten when, exactly, Drupal uses the plus symbol in the URL, but I know it happens under very specific circumstances. These situations are almost always overridden by the Pathauto module if you've configured it properly.

Waiting for more info from surge_martin.

I too would like to see token support in this module. Ideally I would like it to work in a similar fashion to the way that the 'custom_breadcrumbs' module uses tokens.

Example:

I have a content type called 'blog_entry' which is aliased (with pathauto) to have paths at:
/blog/2010/09/blog-entry-title
and for each of those nodes I have views set up to produce a feed of the comments for that entry at:
/blog/2010/09/blog-entry-title/feed

So, I would like to use this module to attach that feed to the node. So, I would like to be able to attach a feed with a path of:
(something like) blog/[arg1-alias]/[arg2-alias]/[title]/feed
To a path of:
(something like) blog/[arg1-alias]/[arg2-alias]/[title]

Currently I'm having to achieve this by using a custom written module, but it would obviously make more sense if I was able to use this module to handle it.