what to do with breadcrumbs filter?

[Allen Gilliland]

is anyone using the breadcrumbs filter?  anyone have an opinion on what 
happens to it in the future?

it seems like its an undocumented and somewhat hacked feature, so i am 
thinking that i'd like to do 2 things ...

1. add a config param which can toggle it on/off.

2. make it disabled by default.

objections?  opinions?

-- Allen