It's a religious issue that is repeated everywhere in the Free Software Community. I see the debate is still raging on in the mailing list. No requirements to ship source with commercial apps Of course, get back contributions to code. Otherwise KGI must be modules. Of course BSD requires BSD license.
Public domain is out of the question.
No control of code whatsoever. There could be multiple source trees. We should allow all driver authors to use whatever license they want. However I think we should propose a very free license as the default. Now if this linking poses a licensing problem, then lawyers are weird.