This line is far from agnostic:

https://github.com/python-bugzilla/python-bugzilla/blob/master/bin/bugzilla#L38

Seems a cool hack for redhat users, but I find it annoying to write --bugzilla url everytime

I bypass it with an alias:

$ alias gbugzilla=' bugzilla --bugzilla bugzilla.gnome.org'

but would be great to read defaults from a ~/.config/bugzillarc or similar.

That would spread the usage from this fantastic command line tool