I mainly buy from my PC and I agree that the main problem (aside of storing emails, I'm a mail hoarder, I agree
) is the CC issue. I've already experimented too and it's a problem. I agree that it's a CC company problem, not Kobo, but shopping cart would be a nice plus for me.
And kaikara, to check which coupon apply to which books shouldn't complicate the checkout process at all (it's not a complicated software task, I'm sure about it).
And, if they want the coupons apply only a book, I think it should be able you to choose the book (more expensive, of course