Having only had the chance to play CotH once and looking around I'm quite disappointed to see that I cant quick match into a specific game type, only into generic (unable to pre-pick captain or crew first is another minor gripe). This bothered me more when I can only filter by map to get a specific game type.
I'm proposing either:
TF2 style quick match, allowing either specific map pick OR just game type; In this case captain/crew toggle would also be needed.
WoW's Dungeon finder style menu to flick on/off specific maps with a "Must/Can/Can't captain" toggle. With this option being able to join as a group/ship(s) would also be appreciated to play with friends.
The match viewer also needs filter by type adding as while currently there are only a couple of non DM maps, some people want something other than a DM without caring what map.