Lock/Unlock the board for the same user in different modes of interacting with the board

When reviewing a large board, it would be helpful to be able to “lock the entire board” to prevent changes. What I’m seeing is someone who comes into the project when many things have been fleshed out already and is trying to get familiar with the whole thing. Right now, especially when interacting with it using trackpad, my colleagues often moves things around. I don’t want to change their permissions, as they are also contributors to the board, but it would be helpful if everyone had a toggle of some sort between “lock everything and just browse” and Edit mode. The comments should still be available in this “preventing changes” mode. 

Not sure if such way already exists, my devs have been using the public share link in incognito mode to achieve that but it’s a bit clunky.