you could write a plugin to hide the default loading meter and get progress values (krpano.progress.bytesloaded, bytestotal, etc) on a timer or enterFrame event
yeah there is no pway to formally change unless what is stated above works. i have seen other examples in these forums with different loaders bars though so somehow it is possible. there is a post where someone has 4 screen on a wall that plays a car video he has a different loader. cant find it at the moment though.