Could we have an option to show active UPNP connections and ports ?

There are telnet commands for that (which are accessible in the Web Console on newer routers like the 2860), "upnp tmpvs" should show the currently active UPnP port forwards.

Great, so should be easy for you to move these results onto a menu in the front end gui.

Well, us admins don't develop the products, I doubt anything is 'easy' and one person asking for a feature doesn't make it economically viable to develop it... Who uses uPnP anyway, and then cares about what ports are opened ? By the time you find out something's open that you didn't want, it's too late

I'd disable it...