When you are looking for something to increase your enjoyment of Conquer Club, look in the
Available Tools/Enhancements forum. Some of the most popular of these add-ons now have detailed guides for installation and use right here:
Conquer Club User Guides. On that page, you should check out the
Saved Searches User Guide. It can do a lot of what you are asking for, but I don't think it can search on the number of empty slots in a game. Of course, once you whittle the list down to your favourite settings on your favourite map, you may find the number of games much less daunting. Enjoy!