Allow Incremental Deployment of ARM templates
When deploying a template via URI (http://portal.azure.com/#create/Microsoft.Template.....), allow through a parameter or other mechanism the ability to deploy in either Complete or Incremental mode. It appears as though it only wants to do Complete.
This is an issue in that you cannot put a storage account in a template with a server build, where you intend multiple servers to utilize the same storage. The second, and subsequent, builds fail validation through the portal saying that the storage already exists. When run via powershell, it deploys fine.