People usually don't care much if their web site is doing something wrong, but definitively will complain when money is involved!
If you have any doubt, want to report a bug or propose a new feature, e-Commerce dev team provides some ways to do so. You can go to:
Note that your bug, question or comment might be previously reported by someone else, so do some basic search first.
We work hard to create a bug free module, but sometimes its impossible to cover all possibilities. If you found a bug or something that seems to be wrong, dont hesitate. Go to Drupal's issue tracker and tell us what is not right.
Mainly because we work on e-Commerce during our spare time, we may not reply all issues promptly. Be pacient.
If you know something about PHP and e-Commerce module, you might try to fix yourself and provide a patch. We will appreciate and probabily commit your changes quite soon. If you dont know how to create a patch, you might take a look on Drupal handbooks.