Take AE2 Mod as a example, the mod sends custom packets that pypasses cauldron/bukkits event system. Select the quartz wrench item and HOLD LSHIFT TO RIGHT CLICK THE BLOCK OF THIS MOD, this block will drop without any residence permissions.

There is no support for mod's and they are completely different than plugins, this plugin is made for bukkit/spigot so don't expect it to fully work with forge moded servers.