hello to all!

i spent an hour or so of semi-distracted floundering through NeXuS settings and i couldnt find much in the way of customization for subdocks.
what im looking to achieve is that on my main dock id like an icon to launch the subdock but with a different theme. ie. instead of the traditional dock id like it tiled. is this possible???
if not? why not?
also can a subdock's margins be changed to move it higher etc?


below is a screenshot showing my main dock and the sub open above it. both have the same background theme and this is what id like to change.

its a steam game launcher but id like for it to appear as though projected from the dock below as a hologram.

thanks in advance for any info on this..

Jem