Great Idea Rated 4 out of 5 stars

Congrats, great idea...
I made a similar plugin, but it changes the entire host file (I use several hosts at same time), check it out: "Change Hosts"

This review is for a previous version of the add-on (1.4.5.2.1-signed.1-signed). 

thank you, marco, Hostadmin learn how to refresh dns from dns flusher