Why are you having such a hard time understanding that it IS ALREADY CONFIGURABLE!? BU has done nothing more then add a GUI to a system that is already designed to reach consensus based on the code individual users decide to run. It says this very clearly in the whitepaper, do none of you understand how how Satoshi envisioned this system to work? How can you even invest in Bitcoin when you don't understand these very basic facts, because otherwise this system would be extremely fragile and would make no investment sense at all.
Of course, everything is configurable and to a developer their is little difference between recompiling from source a few changes in the code and making the changes with a GUI. To a non-technical person, this makes a world of difference and has a profound political impact however.
Sorry but if you really think bitcoins success lies in the fact that a simple change can only be made by a developer then the system is completely doomed. Good thing emergent consensus does not work like this, anywhere in nature.