Hello Markus Berchtold,
Thank you for using our services.
We have not planned this feature yet. As the new Silverlight uploader lets you select multiple images to be uploaded at once we have not thought of the zip upload. Probably it will be good to add it again. I will put this for a discussion with the team.
the Telerik team
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Telerik Public Issue Tracking
system and vote to affect the priority of the items