First I thought the KOTCS music was not that good, but the more I hear it, the more I like it.

The "penitent theme" from Crusade is great but I would not want to hear it in Indy 4. Just my two cents, it does not mean it could not work well. It's just too "Indy 3" for me. The only musics that I personaly would use in a Indy 4 edit are from Raiders. Cause every sequels keep some main themes from Raiders and add their own to it. I don't think an addition of ALL previous movies would be that great.

That said, an edit is the vision of the editor. Do as you wish, always.