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Uploading the zipped file to dropbox and unzipping it inside would save a lot of time and traffic for users. Some of the web services already exist for that (like this one http://www.quora.com/Is-the...
I would really appreciate this feature as well. I would like it to be included as part of our company/group subscription, but would be willing to consider paying a little more if it were an add-on option.