great work updating the coupon module, before I install it over my current Coupons module, do I need to run the Drupal update script afterwards?

now some questions/suggestions:

Is it possible to make a coupon code valid only for one item? Or free shipping? That way we can have promos like "enter code XXXX to receive this product for free".

Also, since there's already an expiration date for coupons, any ways to make a "starting date"?