Hi David,
I've recently tried my hands on integrating our Google Ads accounts with AA & I was able to change the {keyword} in the settings in Google Ads (if that's what you are referring to). If not, can you mention which fields are you referring to - that are optional?
I'm placing the campaign tracking code (from AA- advertising account) to the campaign tracking template in Google Ads & when I test it out it shows the appended keyword.