The current ecommerce features in mojoportal are very rudimentary, it will be a while before it matures enough to handle general purpose ecommerce. For now it only supports download products. It is only now beginning to be tested in production ecommerce on this site. I will be making improvements to it as my use of it here evolves. Other people may use it too if they like, but everyone should be aware it is not a seasoned and proven ecommerce solution yet, it is just in its infancy.
If you'd like to post what your requirements are I will consider them while implementing improvements and perhaps can let you know how far away we are from meeting your needs. If the gap is not too big, we could potentially give your requirements some priority if you wanted to sponsor some of the development or make a commensurate donation to the project.
Best,
Joe