Hey Ramza,
Following the documentation and putting blkrt in custom parameters just shows nothing on status screens and throws an error in the equip scene: "user.getBlockRate is not a function."
Edit: I didn't change anything other than the filename for the plugin back to the default naming and now it works. Unsure if that would actually cause it, but seems to be working now so whogaf :D
Separately: Is there any chance at getting this plugin to display the icon for whatever shield is equipped over the actor during battle either in place of, or in conjunction with the block animation?