Jason, Could you please tell your development team that this is something that is very badly needed in future versions of the program?? In fact - had I know in advance that this was impossible, I wouldn't have purchased eCart. This seems to be a major omission.
So what you're saying is to have the customer check off the items that they might want (and this is almost unacceptable from a usability POV) and then once the shopping cart comes up they put in quantities? That is so clunky and unprofessional from a webstore.
Is there no other work - around for this? Can you please try to inquire further?