Custom Lag Tolerance

[Sligkid]

I've come to legion straight from MoP, and in MoP there was an interface option called 'Custom Lag Tolerance' that would, I assume, prevent your client from sending keystrokes to the server until after a certain amount of time, usually equal to your latency. This would help smooth out gameplay by not having keystrokes do nothing and interfering with your rotation (due to considerable lag). I've read in the official forums that this is still something that is used in legion despite it no longer being an interface option. There are suggested console commands to view and edit this value but they don't seem to work (/console SpellQueueWindow xxx) and (/dump GetCVar("SpellQueueWindow") which returns the line 'empty value' which makes me think it's simply not implemented on this server. Is this feature implemented here, am I using the wrong commands, or am I completely wrong about this feature? Thank you