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AFAIK currently CMCW games are not included in any existing ladder.

Should they be in 
Combat Mission x2 - Modern
 
or should there be a new ladder for it? 

CM Cold War is part of the modern ladder. If you pretend to report a game (or if you really have one to report) you can see the selection under Game once you select Combat Mission x2 Modern from the ladder drop down.

There is a scenario list too.