Jad options
Jad has many options that allow the decompilation and its result to be tweaked. Most of these options are represented by this configuration view.
Jad options within IntelliJad
Note that some options, such as redirect decompilation output to standard output, are not available due to the way IntelliJad manipulates these features.
The options available here are (hopefully - please tell me if they're not!) self-explanatory.