Options->MouseKeyboard Customze Key Bindings-> Melee Heavy Attack
The option above does not work as intended. To do a melee heavy attack I need to hold the keybinding for the "Melee Attack." This is not the biggest issue in the world because my current solution is to bind 2 keys to "Melee Attack" and click with one key while holding with the other. I just thought it was silly to have an option like this but not have it work. (This may be a vestigial bind from when channeling was a thing)