custom sizes field for product page in admin interface

Hi,

At the moment I have 3 dimension options for a product (see http://www.westick.ro/stickere-decorati ... -pattinson), a standard one for which the initial price is available and 2 others for which the price increases. I have done this using an option "dimensions", radio button type, entering the dimension to the value's name of the option. Then, in the admin/product/option interface I have to select the option previously defined "Dimensions", then the dimension value and after that the value within the price increases. But when I add another product I have to add again the option's values and then return and edit the product page and look after the previously added dimensions through other few hundreds.

So, I'd like to have a field in the product edit page in which I enter directly the dimensions for that specific product and the variations of price.
I'm willing to pay this custom module if necessary.

Thank you in advance!