1. Studio one has this already
2. Vote for it here https://answers.presonus.com/3240/articulation-editor?show=40605#a40605
3. Not possible due to the audio engine last I heard
4. Good idea, you should make a separate standalone feature request for that, greatly increases the likelihood of it getting implemented. In the meantime I’m sure you noticed the scale on the left hand side of the Audio editor?
5. See 4