I performed the Keeley mod on my BD-2, and i was impressed but not Blown away, so i made some changes to it to suit my needs. there are some killer BD-2 mods on here and i used them as guidelines for my own personal mod.
the coolest thing about the BD-2 is the 4 diodes, which you can use to do some crazy things, like, adding jumpers or experimenting with different diodes, like LED's, 1N4001's, Different Geranums, etc.. I would suggest soldering in sockets so you can play with the diode configurations.
Experiment, you will probably find a mod that is better for you in the end... It's all about having fun, and being an individual anyway.