I am sure this will work but if it doesnt PM me and I will put together a uninstall for it.
What it does is run along side the normal yes/no ignore mod/admin one. But if you are a mod/admin you can still ignore users... but if you are a mod/admin you will realize that you have blocked someones post and still be able to read it.
If you are a user and try to blacok another user when this is on then you will get the error message "Sorry user blocking in disabled."