Hikashop customize vs others shopping cart

Comparing the results I am achieving with hikashop vs other website (regalameoink.com <-- plis visit and compare).

I found some features they have and I do not, these are:

1. the size of the popup window is sized at 100% adaptable to content.

2. the other website used the scroll bar of the background page, with this the users navigate to much better on netbooks, or small size devices.

3. background becomes not as dark as my project.

so,
1. as I can create showing products pop all its contents?

2. how to enable scroll bar for the back window?

3. who make more clear background when see a popup of product?

1,2,3 ¿as?

thank you!

its possible?