[Engine-devel] adding a second disk to a new VM

When creating new VM, you are asked if you want to add a virtual disk. If you do, you are asked if you want to add another. The issue is that while the first disk is being added, the VM is locked so unless the first disk is added very quickly, a second disk cannot be added and the user will get an error saying that the VM is not down. I think user may find this confusing and/or annoying. Is there anything that can be done to improve this experience?