I see what you mean. Yes, this kind of feature would be nice to have. Unfortunately, I've abandoned this project a long time ago, leaving no one to work on it. I'll leave this feature request as open, though I don't expect it to ever be implemented.
Hi, not sure whether feature requests are still relevant for BFilter, but here is one that at least for me would allow replacing Privoxy (with its cumbersome configuration) with BFilter.
What I would like to have (and have in Privoxy) is a proxy configuration similar to follows:
.