Please, add two toggles instead of one - one for protection from breaking/destruction of blocks and one for protection from interactions with blocks by hands/items. It is annoying, many mods are using non-standart mechanics, for example, Infinity Buttons (https://modrinth.com/mod/infinitybuttons), Create: Things and Misc (https://modrinth.com/mod/create-misc-and-things) and many more blocks from mods which needs interaction with them by RMB are non-usable inside claimed areas.

Add exceptions through the main config file the same way they're configured for things like doors, buttons, chests. You can even configure a single exception group that includes all block interaction just like what you're suggestion, but it's a horrible idea, which is why it's not available by default. Add exceptions for specific blocks instead.