Install Proxmox 3.1 from existing Debian wheezy

Hi,
I've followed instructions in http://pve.proxmox.com/wiki/Install_Proxmox_VE_on_Debian_Wheezy
for installing proxmox 3.1 from an existing debian wheezy. Following that wiki I have to use repositories pve-no-subscription. In this manner I have proxmox 3.1 not for production purposes.

Can I put my subscription key by command line, and then use pve-enterprise repositories?
How can I install proxmox 3.1 using stable repository?
Or for having stable machine the only way is use proxmox iso installer?

Tnx. Marco.