Yeah i wouldn't run all game at once but if you want to play an x amount of all 4 games, you can go individually through the drop down menu adjust the number without creating a schedule and then go to the final drop down option "all at random" and it should pick up the settings you've chosen for all games.
I believe multi accounting is being worked on but we only have about 14-15 days left so not sure how time consuming it is to add that feature.