Prior to the new Soundtrack style came, I unknowingly was using the proposed standard, which mentioned to remove score and soundtrack completely, I would like to know how it actually should be entered so I can fix my mistakes. An actual standard would be nice.

My take on it is: If you don’t feel like it’s a title, then don’t put it in the title. (looks like this is what you’re doing). From what I can see it is not necessary to put it in the disambiguation either, since they are on different labels and in different countries. (and therefore unambiguous.)
*BUT* it’s OK to put the disambiguation in too, if you feel it help.

As for release groups, I might also split the collector’s edition away from the others since they don’t seem to have any tracks in common.

The above are all just opinion though, not guideline or fact.

I would rather this be on the mailing list to be sorted by people who know musicbrainz better than I.

Prior to the new Soundtrack style came, I unknowingly was using the proposed standard, which mentioned to remove score and soundtrack completely, I would like to know how it actually should be entered so I can fix my mistakes. An actual standard would be nice.

18 track version is Original Score
http://vgmdb.net/album/20130
http://musicbrainz.org/release/7c3d0468 … 17b00d32a8

13 track version is Soundtrack
http://vgmdb.net/album/31556
http://musicbrainz.org/release/c0996b70 … c18ae77be7
http://musicbrainz.org/release/982a6e65 … b3b232f2c4

10 track version is Soundtrack
http://vgmdb.net/album/18149
http://musicbrainz.org/release/15bf6a51 … a7d34f7f04
http://musicbrainz.org/release/3210c925 … 67ee324292

Korean version says Soundtrack in Korean
http://i14.photobucket.com/albums/a340/ … b4625b.jpg

Japanese version (maybe) says Audio Disc
http://blog-imgs-35-origin.fc2.com/m/o/ … lade19.jpg

(Sorry, couldn't resist.)

but it could also be seen to be just part of the artist credit, not subtitle or title — in that case it is necessary to put it in the disambiguation comment, because we do still need a way to tell the score from the other soundtrack. Of course, since only one of these releases actually have cover art it’s kind of hard to tell for this case.

Then when using disambiguation comments, wouldn't Alan Wake as a release group be for all music distributed for Alan Wake and the releases themselves use the disambiguation comment that they are a score or soundtrack. Otherwise with say a Final Fantasy game you will get 4 or 5 release groups for the same exact game just reprints of the soundtrack or maybe different masterings. However that does then limit the editions use or other specific comments that can be made.

So for the Alan Wake score, you could use something like “Alan Wake: Original Score” (treating it using normal subtitle style)

Or you could just use “Alan Wake” and use the disambiguation comment on the RG to indicate that it’s the score. (and then on the releases themselves you would use the disambiguation to give edition information if it’s not part of the title or otherwise obvious)

Alan Wake Original Score
Alan Wake: Original Score
Alan Wake (Original Score)
Alan Wake [disambiguation] Original Score
Alan Wake

I don’t really understand but with this I would do:

Notice that there is no TiTleStyLe on versions (RemixStyle).
This way we could also have

An example would be a release for a limited edition and regular. The disambiguation is already taken up by "Original Soundtrack"

There are others like reprints, and different country releases.

So should it be
Alan Wake Original Score
Alan Wake: Original Score
Alan Wake (Original Score)
Alan Wake [disambiguation] Original Score
Alan Wake

I’ve gone through and cleaned up the entities used as examples.

With the release of this newer version. Should all previous revisions to soundtracks and the like be changed back?

Example would be adding Original Score to the release group and the release
http://musicbrainz.org/release/7c3d0468 … 17b00d32a8

Same with Original Soundtrack or however each one is named.
http://musicbrainz.org/release-group/7b … 651f278c26

also what separator should be used if that is the case, a colon or ( )?

The guideline is pretty verbose but too few examples throughout, and clicking through some of the examples they don't look the same as shown.