Yes, you can adjust the parameters for in-camera processing to boost the saturation.

It's been a while since I checked out those settings on my DRebel, but I do remember not needing my computer to do it. Perhaps you can create custom settings with the computer... I'm not positive, but I think the parameters are used for in-camera processing of jpg files and I don't think they affect RAW files. Someone please correct me if I'm wrong.

Are you shooting jpg's or RAW? RAW files look a little duller straight from the camera because of the lack of in-camera processing.