For what it's worth, a few comments for the first usage:
*The file size (JPEG 16 Mp, 6 Mp, 2 Mp) is one immediate selection to consider as well as the JPEG quality.
*The RAW+ option is another one easy to setup.
*On the typical individual shot mode, I would recommend to switch On Shake Reduction (unless you use a tripod all the time) and Lens Correction especially if you use a Pentax lens.
*In a continuous shooting mode (Hi), on the other hand, you want to remove all post-processing including Lens Correction, and I recommend to choose a JPEG mode that allows you to transfer 5 photo per second to your card without saturating the buffer. For example, with a card Class 10 (30 Mb/s), your JPEG file size should be less than 6 Mb.
*The USER mode is another interesting option to configure. There has been a very recent thread on the topic.
As mentioned by others, the default exposure are good.
Hope that it will help.
Last edited by hcc; 12-29-2009 at 05:10 AM.
Reason: typo