GPO To create SNMP community

I have snmp service installed on all of my desktops which are all runing WIn 7 64.  I need to add a community name with read/write permissions.  I have looked at the snmp gpo while it appears that I can add the community name using the community setting but only with read permissions. The utility I used to install snmp on the desktops only allows communities with read permissions or I would have used it.  Can anyone please let me how I can accomplish this.  I am setting up HP Web Jetadmin Proxy agents in order to manage all printers that are attached to the desktop.

Thank You