Ok... corrected. Actually, I just wanted to answer to you.
I tried to post in the NITDroid topic and even in the NITDroid forum, and I just got one answer which said that U-Boot has menu entries both for BackupMenu and NITDroid.

So, I wanted to try U-Boot.
My idea was to remove multiboot from NITDRoid, so I guess NITDroid won't load anymore, and add an entry in U-Boot, but I don't actually know what to do without messing all.
I don't know if it's "correct" to copy NITDroid entry from multiboot in U-Boot folder and if that will work.