Hi @thoumasuk, sorry for the late reply. This could definitely be added, thanks for your feedback! Since I wrote this post I release one or maybe two more versions based on the feedback I got from the community.
Let's see if I find the time to make it, I will write a post when I release a new version of it!
RE: EOSIO Block Producer Alarm - Get alerts when your favorite Block Producer changes rank on the EOSIO Main net!