I've changed my assist button from [Backspace] to [Back Slash " \ "].

Whenever I type something, be it /say or /gu or /trade, I disable keymaps.
Once you get into the habit, its is quick and easy.
Coming from Keyclone, and already used to the pause button when chatting, this wasn't too hard to become a habit.
Learning to use the pause key, well guild was spammed a lot the first couple of weeks.