Q: So, specifically, as relates to my 1.8T, what can I do with it?

Idle Speed Adaptation:

With engine warmed up, at idle:

[Select]
[01 engine]
[Adaptation - 10]
Enter channel 01
Enter an adaptation value between 124 and 132
[Save]

taken from this page: Ross-Tech: VAG-COM: 1.8T VAG-COM Info*