I think samsam is the only one who can add to the iptv programme as he originated it - from memory he gets inundated with suggestions of what to add as you could prob expect. do a search on line and you will find links to how to contact him,
I reckon some of the wizzo's on here could set up or tell you a way to add content to the menu/channel list (poss an internet bouquet add on) but I doubt it will be through the current iptv programme
if you open up your channel list bouquets you might even have a go at it yourself - I tried n a v8s ages ago but got lost along the way so gave up. the newer gemma has a lot more processing power, so it might be worth having a tinker