a couple of issues I can't solve (config vs. result)

[simoncn]

The correct way to solve this is to use a match filter in the folder name. For example, to prevent the albums named

1977 - 2001 - Rumours {Remaster}
1977 - 2013 - Rumours {Expanded Remaster}

from being merged, you could name the folders for these albums as follows:

1977 - 2001 - Rumours ['Remaster']
1977 - 2013 - Rumours ['Expanded Remaster']

There is no need to change any tags or set any properties.