Would be nice to have the possibility to lock layers. Just stepped over an annoying thing. When I have a long page with tons of layers on it and wanna drag in a new element from the Elements panel to the bottom of the layers list all the collapsed elements open automatically and I need to drag all the way down the whole list to position it into the right place. Thats pretty annoying sometimes.
Then I had the idea that layer locking like in Sketch or PSD could be helpful maybe.
Lets see what the community means ;)