Hello Martin,
Thank you for your interest in CS-Script.
>Is it possible to use your software in our commercial product without any restrictions?
Yes you can use CS-Script in any commercial product. The only restriction is that the source code modifications. Which if indeed required need to be done through consulting. Otherwise there is no restrictions whatsoever.
>If so, are there any requirements like mentioning that we use CSScript?
Mentioning would be greatly appreciated though it is not mandatory.