Check the back cover I've posted for "Skull"... some expanded track based on DVD-rips (some from the DVD-menus and -extras, some from the movie itself). The user "crumbs" on the JWFan.net-forum made that "expanded" version.

You should definitely have a look at the new www.IndianaJonesMusic.com, which gets updated constantly right now. Check the "spreadsheet"- and "missing music"-categories, where you can see where some extended tracks can be found (some on unofficial bootlegs, some in games, etc. ...).

Also have a peek at the Unreleased Music-thread (and other Indy-threads) over at the JWFan.net-forums, where some people have posted unreleased cues they've recorded using the original sheet-music, and a LOT more info on the soundtracks.