Upfront slider: auto scale slider hight to with image hight

Hi there So here what I would like to do but can't figure out how:

I would like to stop the slider from cropping the slides but still have it 100% wide.
The result being that the height of the slider would responsibly scale down the height. Similar to what I did with the banner image on http://terryblack.ca except a slide show.

If you could help me with that that would be wonderful. Also this would be a great feature to have a button for on the slider background.

Also, I should mention that all of my sliders are areas that I have used the slider on the background. Hoping that isn't an issue : /