I had recently requested if the Group Node can have a preview enable feature. Would you belief in less than 16 hours Alexandre Gauthier implemented it for the graph panel and extending it into the dope sheet.
Why did I make this request you ask? Well as you and myself start to really take advantage Natron’s compositing core, the scripts and graph view will start to get really big. The Group node provides more robust organization structures and Pynode development that the basic Backdrop node doesn’t provides. So, if you have a lot of images and processes going on in a group, it will make it faster to see in the graph for what node or group is doing what.