I think that WGT should look into adding a section where you could select a specific country of players you want to invite into your game, whether it be one country or any available, similiar to where you can select hack, pro, master, etc.
The reason for this extra option is that it would help with loading times for a specific game, language barriers when discussing a game, allow the opportunity to find more players within your timezone to obtain as friends for future games, etc.
If you boot a person from a game because of whatever reason, they get very aggressive and negative towards you, whether on your wall or repeated efforts to join your particular game. I believe having this feature would eliminate issues like this.