Config option to declare whether you're using bridges for reachability or for security
https://blog.torproject.org/blog/different-ways-use-bridge describes two different approaches to using bridges: one type of user wants a bridge to increase reachability, while another type wants a bridge to increase security.
In an ideal world, we could do both for both types of users. But there are an increasing set of situations where it looks like there's a tradeoff.
This ticket could become the parent for a bunch of little tickets. Or maybe this is just one big ticket with one branch once we decide all the pieces it should touch.