RQC Customization

Has anyone here done any customization work within RQC? What I want to do is based on the item type a user selects, I want to default values based on what their selection is. To start, I moved the Item Type drop down to the "Profile" tab in RQC, but I am not sure how to pass the logic on the other screens to default certain criteria, and pull this value back on the shopping screen.

Any ideas? Currently stuck between a rock and a hard place.

Thanks!