Couple of points I noticed.

[elextr]

Couple of points I noticed, wasn't by any means a real review.

1. some of the keybindings clash with standard ones, ++e and t at least, didn't check all the rest.
2. in zen_controller_init_python() the variable resident_pylib is static so its only ever initialised to NULL once, not sure if thats part of your commented intermittent crash on subsequent calls
3. even if the python lib isn't found you fall through to try to initialise anyway, that would probably be a crash.

[codebrainz]

That's all you found? :)

I haven't even really touched this since last year, so not too bad :)