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Improvement
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Resolution: Unresolved
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Normal
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None
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None
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Currently releases which have a discID do not allow the tracklist to be edited at all.
It would be nice to be able to add 'sub-tracks' to indicate track indexes other than 1 (including track 1 pre-gap as well as index 2 and beyond.)
Example of a release which has extra indexes:
http://musicbrainz.org/release/0f0ee898-5d36-42d5-a77a-5161331aae6a (track 7 has 4 indexes total). DiscID is here: http://musicbrainz.org/cdtoc/pzH0NGo5pnBHn9eEKKz8yHcAkJg-
[MBS-6045] Allow editing (sub-)tracks for releases with discIDs.
I voted this ticket because we lack track indexes support. This ticket is about that. 
"Also I think that there should be a better support in the webUI for the compilation relationship
especially in the release editor and in the release page."
Yes, this is what I was particularly asking for.
The compilation relationship type is not very helpful for this, unfortunately.
pre-gap is related because it is "track 1.0" (i.e. index/sub-track 0 of track 1).
For sub-tracks we have recording - recording "compilation" relationship.
http://musicbrainz.org/doc/Compilation_Relationship_Type
Unfortunately this relationship is missing ordering information.
There is already a ticket for ordering of sub-works which is similar to ordering of sub-tracks:
http://tickets.musicbrainz.org/browse/MBS-3375
Also I think that there should be a better support in the webUI for the compilation relationship
especially in the release editor and in the release page.
Also I am not sure if it is suitable for the track 1 pre-gap.
There is already a ticket for track 1 pre-gap:
http://tickets.musicbrainz.org/browse/MBS-967
It would also be nice if there was a style guide or FAQ entry for handling CD tracks with additional (separate) songs as indexed parts of a track. The closest I've found is the RFC linked to in STYLE-121, however sub-indexed tracks are still (more than 10 years later) not supported.