Ant
Also fi2enc utility need to be modified to generate fi2 file with multiple data blocks.
No, that would be unnecessary unless the aim is to possibly destroy the camera. It would be much easier to just reuse the updater extracted from FI2 (the part that runs from RAM) and replace its FI2 parser/flasher code with a custom flasher routine (one could flash back an older ROM dump, completely, leaving out just the bootloader).
I ported most of the 100a port to 110b, but I did not feel like releasing that due to the experimental and buggy nature of the port.
The reason there is still no official release is that I'm not satisfied with stability (and I wasn't working on it lately). For example, a r6048 based build just crashed on me, and it fails to mask the "jogdial" in ALT mode for some unknown reason.