Thanks for the suggestion, but we've been over this quite a bit here in the forum. There's a summary of our thoughts on how much detail to track here:
Why don't you track more vehicle details?
We know there are a number of people who want more detail, but we feel like that would keep an even larger number of people from using the site. By striking what we feel is a good balance, we believe we'll all have more people reporting their data.
We know this means we lose some people in the process who feel like the data is useless without more rigor and structure, but that's part of the balancing act.