Problem:
Current background image settings in Captivate are rather limited and don’t fully reflect the flexibility of CSS.

Suggestion:
Add support for the following additional background-related properties and options:

• Background attachment — Currently only scroll is available. Adding fixed would enable simple parallax effects.
• Background position — Currently only horizontal alignment is supported. Vertical alignment (top, center, bottom) and relative or absolute positioning (percent, pixels) should be possible.
• Background repeat — Only repeat is currently available. Separate control for repeat-x and repeat-y would be useful.
• Background size — Currently only contain and cover, as well as Stretch and Original Size are available. Instead of Stretch and Original Size, free scaling via percent or pixel values would be desirable.
• Background image — Only one image can be defined. Support for multiple layered background images would enable more complex designs.
• Combined backgrounds — Allow combining background colors, gradients, and images within the same element.

Additionally:
Documentation for all supported background-related properties in designOption.json would be very helpful.