As you may already know, all client printers are visible to Local Administrators/Power Users. However, it is not possible to manage these printers without taking ownership (via Security tab). You get an "Access Denied".
You can, however, set a global flag to enable managebility. Use regedit and do the following:
- Add a registry key on the server: HKLM\Software\Citrix\Print
- Add a REG_DWORD with the value "DefaultPrnFlags"
- Set the bit to 0x00004000
This feature is also covered in the Citrix Advanced Concepts Guide, available here