Some group chats are very active. It's not useful to be notified of every single text that comes through. It would be useful to have a "cool down" setting so if texts are received during the cool down period it will not setoff a notification sound/vibration.

Example: 5 mins cool down. First text will setoff notification, there after notification will go off for that thread within 5 mins. Useful to temporally mute multiple annoying notifications from same user/group.