If the group includes at least one song from each album, including putting Miss Sarajevo and The Ground Beneath Her Feet either on the main album or the bonus disk (and from what I've gathered that seems like a decent assumption), then I don't really see the point of them adding a bonus track. Nothing from October was represented on the first package, each album got at least one track except for that one so they added the title track to make up for that. I think that each of the albums released over the past 10 years has a very excellent chance of having at least one song included on one of the disks.
I don't see that Mission Impossible would fit because it's not a U2 song, it was a Larry and Adam side project. If they put that in, then why not something from "In the Name of the Father" as well?