Blender doens't find the Python scripts in /usr/lib/blender/scripts/ I thing that's an ebuild bug... Workaround: mkdir ~/.blender ln -s /usr/lib/blender/scripts/ ~/.blender/
No, actually it's not a big deal. You just pull down the tool bar at the top of the screen and enter the correct path in the "file paths" options.
Upon installing blender, the plugin path should "just work".
Agree that this should work out of the box... And another: Let'say I give /usr/share/blender/scripts in the config inside blender.... Blender now cannot find the scripts at /usr/share/blender/scripts/bpymodules You cannot put two dirs in the config of blender.
[sidenote]I submitted a Feature Request item #5031 into blender bug-tracking system. In summary, I suggested this: 'I suggest blender have a "default" system-wide directory, that could be defined at compile-time (so each distro could define its own dir). This will be a "system directory". In addition, users should be able to set directories themselves. So the current "File paths" interface should be kept.' I would give you the URL to that item, but looks like it is not public anymore. I myself can't access it.[/sidenote]
This also stops some Python functions of blender from working if you set your script path to /usr/share/blender/scripts (since it needs to write soem files there). A workaround is to copy the entire /usr/share/blender/scripts folder to ~/.blender/ and set it as your script dir, but that is hardly desirable, so I think a severity bump is in order.
That part should be fixed loong ago...