Cascade product options and upload customer file

-- HikaShop version -- : latest version
-- Joomla version -- : 3
-- PHP version -- : 5

Hi,
I am evaluating hikashop with two other ecommerce software to see if I can adopt it. The documentation is really good and it enabled me to get answers to most of my questions except two questions. Hope you can answer me :
- I want to enable the customer to upload a file (his photo for example) so that we personalize some personalizable product we sell. I expected to be able to associate to a product a file option or file characterietic that acheive this requirement. But could not find in the documentation such option/Characteristic.

- The second question is that I want to have cascade options for my product. An example is the following: my product is displayed in the front end with two options. If you choose option1 other options are displayed (let's say just 2), if you choose option2 3 different options are displayed. Is this possible to acheive in Hikashop?

With hikashop, I am evaluating:
- virtuemart which cannot acheive the first point (possible to buy a component for more or less 90$) but can acheive the second one with its child product concept. I did not find an equivalent concept in hikashop.
- Opencart which can acheive the first point but cannot acheive the second one (possible to buy a component for more or less 35$).

Thanks

OK Thanks.
If I buy the commercial version, can I use it for several websites or I must buy it again for each website?

I remebered that the files my customers will have to upload when buying a personalized product will be heavy files (more than 30 mega). Is it possible to upload the personalization file using ftp?

Thanks