This type of support will be coming. We're going to call it 'environment' support, where an app can send data and specify the environment it's sending from (stage, dev, production etc). You can then either see them all on one dashboard, or filter the app dashboard per environment.
Hoping to have something in the next month or so for this since it does require that we re-think a bunch of parts of the Raygun app (e.g. you might want to only receive notifications from production, so we'll need those pages to be updated so you can specify those types of concerns).
I hope that helps!