@pjft and to complete this ... I have collections that are named "RetroAchievements" and "RA - Battle Bugs". The Battle Bugs is for challenging games or for the Monthly Random Game introduced here (Currently Mario RPG).
These collections in combination with a small script Automated Switchable RetroAchievements make an automatic connect/disconnect to the RA server possible ;)
So you all see custom collections is a milestone in the ES development. Thank you pjft :D