Found out, that if you use an own tour.xml, not that one that's generated by the VTOUR droplet, I can`t add/edit hotspots.
With the old flashPlayer Version it was/is working...
My panos are also seperated in scenes like in your tour.xml, but I don`t use the "vtourskin.xml" and the "skin_settings"...
The functionality of the added hotspot is based on the 'skin_hotspotstyle' style and without vtourskin.xml this can be guaranteed. Therefore the editor simply checks if there is the text 'vtourskin.xml' anywhere in the xml before enabling the editing functionally.