I just installed 2 of the sample mods you provided with it.
I found that all the edits weren't done the first time around.
Some seemed to be but then some weren't.
After about 3 times all the edits were done.
It does work, but sometimes it seems to be buggy.
If the file isn't writable it will give a warning (well that's a 'duh').
But then it still says the file edit was completed. I suggest checking if the file is writable before it performs the edits.
If it isn't writable, display a message saying that (so there are no ugly, annoying warning message).
but other than that:
NICE JOB!
I predict this mod will be as popular as the UMI. This thing is great! lol