@Kuma made some great suggestions which I'd like to share here too, to see how many people would be interested in....:)
1. Support for group promotion similar to IPS 4.2 ... If a member invited/referred more then X members => move him to group X ( LMAO, this is already possible, sorry I missed this in the rush:D
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2. Support for @Kevin Carwile Point and Rules app (Rules was requested several times before, but unfortunately I wasn't able to implement it yet) Would you be interested into helping us here Kevin?