Well it looks like to solve the problem for good all that's needed is the nvclock developer to know the registers that control the brightness in the Sony and Samsung laptops, which are laptop specific and not controlled by Nvidia. It's really just a couple of codes, but there seems to be no way to find them also from windows, below a link to the relevant thread in the nvclock help forum:
that thread contains the final enlightenment to this issue. And once we can talk to the chip binding the action to the keys is a no-brainer, they already send scan codes to the acpi interface.
Because I don't think giving out those numbers will cause Sony or Samsung to expose vital secrerts for their companies, is there anyone who knows how to go about asking that to them, which department to contact, an e-mail address; I can do it for Sony as I've got a Vaio, and we could also team up to make more noise.