nice job on the bread crumbs plugin.
Can you please clarify the syntax for the trac.ini config setting for max number of crumbs. You instructions are very vague and it looks like you are saying to use this syntax:
breadcrumbsnavplugin.* = enabled
breadcrumbsnavplugin.max crumbs = 2
where "max crumbs" has a space. This doesn't seem to be valid syntax for trac.ini. Should there be an underscore char between as in "max_crumbs"?
Also, how does one clear the breadcrumbs from the broswer? I realize you say they are stored in a post_process request object (or something like that), but the breadcrumb behaviour I would expect to see would be that as a user back tracks through their listed breadcrumbs, they should be popped off the stack of breadcrumb links rather than rotating those links through the stack to the front. Just curious.
Otherwise, nice job. My users have been asking for something like this for a while now.