Apologies for the wait, I tried to set aside enough time to release DPCIManager this weekend, but still didn't come close enough. Instead I have pushed a massive commit with most of the new code to the repository, but it is not complete.
I am posting #254, to expire on the 9th, until when I should have enough time to compile the latest flashing tools and polish the rest of the release. These expirations are important because of the security issues involved: flashing is no laughing matter and these tools could do a lot of damage in the wrong hands. I have no problem posting the non-security-check code as I've done now, and will be updating the wiki with build instructions for the included binaries when I get a chance.
As always, feature requests are welcome, but I have a GPU framebuffer configuration panel on the roadmap. It would read a card's ROM and compare its ports against the system kexts' entries to find a suitable match; i.e. suggesting Muskgrass and AtiPorts=4 for my 6570.