Blissz, dont release your source code to anyone. Its yours. If people dont want to support the dev fee, they can revert to the firmware provided by Bitmain. If you could introduce a better way to get the dev fee that would allow for more stable mining, that would be great though.
No need to release your code to these whining people.
Most of us have no problem with the dev fee or a flat fee and for those that do it's very easy to work around and disable altogether. Flat fee would be preferred though however, when you claim he shouldn't release the source and that it's his you couldn't possibly be more wrong. Ask yourself, why does Bitmain release their source instead of just claiming it as their own? Without Bitmain's source none of this would be possible. Without cgminer's source, Bitmain couldn't have made the original product. Without many other packages also included and freely sourced cgminer couldn't have made their software etc.... The GPL exists for a reason, to stop people from stealing code and repackaging it as their own and to further advancement in a free and open way.
Blissz' work is great here and by releasing the source he's doing the right thing. He can continue to improve upon it and continue to leave the dev fee in if he chooses. Others should also be free to see his changes to the source and also improve upon them. If this isn't acceptable then I would encourage everyone to work together here to build a new firmware completely from scratch and license it with something like the MIT license without using any software that's currently licensed under the GPL. Without releasing the source, he would be opening himself up to multiple lawsuits should his real identity ever be discovered.
Please don't encourage theft, the crypto community has enough problems to deal already. No need to throw potential lawsuits into the mix as well.