Lumia 950 XL :: Disable Toast Notifications On Lock Screen

I got my 950 xl yesterday and have been having fun setting it up. Fairly new to Windows phone, so a few settings I'm still looking for. Have spent a few weeks reading this forum in prep, so am fairly up to speed with most things/issues to expect - for example my update to .29 got stuck yesterday, with low on space messages popping up, but i found a thread on here which said to plug my phone in and leave it and it eventually installed fine :)

My Glance was set to 15mins, but was always on, so now i set it to 30 seconds and it seems to like this setting. I'm missing Quiet Hrs setting, but I understand this will prob come back in a later update. Hoping the double tap to wake will come back at some point (I experimented with a 640 over the last two weeks and loved that feature). I would also like to disable vibrate on the navigation buttons, but I dont this is possible yet in Windows 10.

My question at the moment is - is there a way to disable toast notifications from apps when my phone screen is off, as at the moment the toast notification activates both the screen and Hello, which I don't think is particularly energy efficient. I still would like a toast notification when the screen is on. Is this possible?