nice idea.

one thought:
i don't know i am very relaxed with such things for i patch up my things that they suit my needs. in general uboot as is is fine and nice for dev and extras_devel is exactly the place where it belongs. i don't know if you want it to stay there or want to have it working for productive. if it is the latter, its rather to fix the problems.than to workaround
that is:
- rebase it to a more recent git
- apply the pending important patches from git(don't like that but in case of severe bugs...)
- see how to make watchdogsupport work,
- solve the mmc thing matan mentions
- create a menu(or adapt one) with some shortcuts.
- maybe have a look at the serial console with the maemo kernel issue ali mentions.

that way you get it somewhere towards a version that can be used for productive.