One thing that really bugs me in GT3 is the explanations.
When you go on tuning something, there is a single line window where the explanation of what this tuning does, is displayed, scrolling from right to left.
I'd rather like an info button like when you purchase a new item, where you have all the definition and explanation of how it works.
Perharps even videos that shows what is the behavior difference would be nice.
In other words, better 'interactive' explanations.