Very interesting. Just tried the new direction codes on my TSU3000. Up, left, and right work as expected, but the new code for down seems to map to either enter or the x button - not sure exactly which, since they both have the same effect in the menus. Unfortunately, I don't have any other remotes to test on.

Here are my testing results:

Up -> Original code worked, new code works also
Down -> Original code worked, new code seems to map to enter or x
Left -> Original code worked, new code works also
Right -> Original code did NOT work, new code does work

I'll try to sit down tomorrow and map out exactly which codes are working and which ones aren't.

Thanks for the help!