Looks like this is a no-go, and I doubt asking for a feature request will go anywhere (but other folks are welcome to try that if they want!). Here is Phil's response from the other thread where I asked about using URL integration to download multiple documents:
After looking in to the behavior, I have this information.
By design, there are 4 URL integration types that will only return 1 document:
The product team investigated the possibility of downloading multiple documents in versions 6.0, 6.5, 6.7, and 6.10 and it was not possible.
Further investigiation revealed that there does not appear to be much call for this functionality. So if it is required then it will need to be registered as a feature request.
So, I guess using the Platform Service or using Folders would be the only way to pull down more than 100 documents at once. Going deeper into that, the URL created by the web client for downloading multiple selected documents is sort of interesting. When you download multiple files, it does it via something like this:
where the "append" parameter is just a comma-delimited list of document IDs. The problem is, if that list gets too long, the download fails with a 404 error. I was able to get up to 200 or 300 documents at once using the Folder idea, but that fails as well once the list gets too long. Perhaps that is part of the architectural limitation DocuWare ran into, making them ditch the whole idea.
Casey, do you recall the largest number of documents you ever downloaded with a URL Integration zip file? It might just be a URL length limitation -- looks like any URLs over 2,000 characters are frowned upon even though the HTTP standard does not provide a hard limit...
In summary, if you want to download more than a few hundred documents at once, the Folder idea won't work, either. That leaves the Platform Service.