I have just readed TODO and I have seen that groups creation have more priority than notifications customization. IMHO notifications customizations would have higher priority. Being added to a group with lot of messages a day could be painful , and now you can't do nothing except ask for being removed from it (and not receive anything from that group) or close Yappari. But if you can't create a group, one of your contacts could do it and add the needed participants too. The hassle is quite less.