This is an interesting idea. Maybe we can add a "Disable/Enable" option to the context menu of CSS blocks. Similar to how you now enable/disable media queries, you will be able to disable the entire CSS block for testing purposes.
You can easily enable/disable CSS Code. You can use plugin for it if you are wordpress.I have used it for one of my bseap telangana results Website and it worked like a charm.You can overview type only for best results and fast loading.