Minor thing, in pybugz-0.10* you need to spell out the whole assignee. eg: old behavior, "bugz search -a prefix" new behavior, "bugz search -a prefix@gentoo.org" It is a regression, but a minor one. If it is intended, fine, but I was use to the old behavior.
The bugzillla web service search call expects an exact match [1], so there isn't really anything I can do about this. We would need an enhancement to Bugzilla itself. [1] http://www.bugzilla.org/docs/4.2/en/html/api/Bugzilla/WebService/Bug.html#search