5d3's is pretty solid as is, the interface could be better but i think ML as is is kind of fiddly so Im not really sure how much more you can expect out of it. EOSHD's guide to getting the firmware working is all you really need, the only major searching might be now that the link to the fw in his guide could be out of date.
All in all im not too worried about the flags or bricking it, I would expect its a minor fix for canon if something were to go wrong(as its just software), unlike getting moisture into it or damage from being dropped.
Well, the parts about installing ML itself are pretty straight forward, but getting to the parts where you have to find the nightly builds, get those parts separate, put them in xyz folder, do the hokey pokey ....is where I get lost.
And also, it the workflow for processing isn't that well laid out IMHO...rather than having it in a forum post that can get miles long with updates, they should have one page, that is updated to always reflect the latest instruction set with proper links, etc.....not only for installing but for post processing.
I'd like to see all files, including the RAW video parts be put into one firmware update rather than having to get the RAW video parts separate....and have a better spelled out post process.
Having to read a bunch of parts all separated out is the sign of true alpha and I'd like to see a more finished product which fromwhat I have read, should be possible for the 5D3....