I’m trying to do a sort of tricky layout and I swear all of the measurements I put in keep changing from fixed to fluid on their own. I mean, I’m certain it’s actually me just pressing something accidentally when going in to change the text. But it would be great to be able to lock certain measurements (likes sizes, padding, margin) and have to go physically press an unlock button to make them editable again 
It would also be great to be able to save these to a design asset, so I can plop 20 of a button with the same margins all around my sites.