Firstly, i added a config file updater to make it easier to add features to your config file, simply install v1.7.0, restart your server, and type /fireballs updateconfig It will make a backup of your old config file, and then load up the new one. Simply copy your old settings over and you're good to go!
Added block protection, add blocks & keywords of blocks that you don't want to be blown to bits with the fireballs.
And finally, rebuilt the entire explosion & knockback system, it should be a load smoother than the old versions. Please send me feedback on how it can be improved, i really want to make it as realistic as possible.
Thats about it! If you enjoy this, please leave me a rating and follow me on spigot for more updates and plugins!