There's a good lot of things to change, loads of options, but you probably won't change them as most are main stream settings. Like disabling stop start, disabling auto wipers or wipers enable boot pop with key things like that which are all standard,unless you do want to turn them off for some reason
A lot of what's on carista just let's you remove options in menues as well, like removing the option in setting for the left mirror to go down when reversing.
The 3 things I did above appeared to be the only worth while changes, I don't get why anyone would pay for carista for more than a week