jordi - first thing i wanted to say was great photography and i love the transition from pano to pano. that is something krpano is way behind on from FPP. Also your top bar inside the pano does not strech all the way to the edge on my 22" monitor. auditorium and shop are floating in the air.
i tend to use separate xmls for almost everything. it reduces load times. even though the hotspots and plugins inside the individual scene tags are not setup until that scene is loaded it all still has to be parsed from the start before anything happens.