Currently the upload limit is set to 100MB. This is something we have control over and can change if people require it. We'll look into increasing the limit in our next phase of updates going out in about a month.
Pre-sales assistance regarding CafeCommerce is available via our live chat or via phone. Our records don't indicate a chat being missed. If it doesn't say we are Offline, someone should be responding. If we are offline, you can leave a message and someone will reply via email.
24/7 Technical Support when using CafeCommerce is provided via DreamHost's live chat feature which you can access from the Support page of the CafeCommerce Manager.
We also have a UserVoice forum that you can use if you would like to suggest or vote for new features: cafecommerce.uservoice.com.