Option combinations Import Issue.

When doing Option combinations import

It has to use Product ID as Product Key, I think is much better if using Product Code as import Key. Since when doing Product import, it use Product Code as key also, and why using Product ID for Option combinations???it sounds strange,

Is anyone have solution on this?

As I am serious of getting my Zen store to CS-Cart, but there is some basic import or setting up function I need to know before I make progress.

Thank you for many help.