There is no way to assign a weapon your combat mastery for the Illrigger class if you choose Lies which allows you to use your CHA modifier for the attack and damage. The only way I can see to do this currently would be to homebrew modify your weapon on the fly (which I personally don't know how to do but my DM does).  Am I missing something or is the ability actually missing?

Following. I was just going to go into customize and update it

Any update on when they will add a toggle for this feature?

Nope. They are radio silent, probably forgot about it already.

Hey WOTC, if you could take a break from updating problematic features for a modern audience and fix this bug, that would be great. Thanks. 

Yeah one of my players are having the same issue.

It's been six months and still nothing. 

I don’t know if anyone has realized yet or if this was updated but if you click on the weapon that you’re using there’s a button for “Use Charisma”

You guys are kings!