Note that the way the tasks are put together ain't exactly pretty--they're just a very thin wrapper on mxmlc / compc / etc. There are some advantages to this approach, but if you're hoping to learn about the compiler options by looking at the task source, it could take some doing.
Learning about the different options was one thing on my mind. Well, I'll take a look and what I'll find.
Seems like Adobe open source projects are suffering from the lack of documentation, which is quite common for all OSS projects.
Flex HarUI, I didn't get your point in sending that link.