Automatic change from pano to pano

In general yes it is possible.
E.g. define on start action and than put your code what you want to be done:

<action name="startup">
loadpano(%SWFPATH%/some_file.xml, null, MERGE, BLEND(3));
set(view.architectural, 0);
set(view.fisheye, 0);
set(view.stereographic, true);
set(view.fisheye, 1.0);
set(view.fov, 140);
set(view.vlookat, 90);
wait(7);
lookto(680,0,60,smooth(10,20,60),false);

tween(view.fovmax, 155.0, distance(179, 1), easeoutquad);
tween(view.architectural, 0.0, distance(1.0, 1), easeoutquad);
tween(view.fisheye, 0.35, distance(1.0, 1), easeoutquad);

wait(10);
loadpano(%SWFPATH%/some_other_file.xml, null, MERGE, BLEND(3));
.
.
.
</action>
This is code that can't be stoped by user. Don't know if you want it or not.
If you are using all scene in one file via loadscene than adapt the code in that way.