Hi,
I don't have smartphone and I wonder if zoomin/out and fullscreen buttons are necessary enough for small screens.
that's matter of taste,
in the default krpano skin from the tools droplets (defaultskin.xml) the buttons are only enabled for desktop,
see the - devices="desktop" - setting in the defaultskin.xml,
Do I have to use only drag mode?
no, you can use the drag2d or the moveto mode:
http://krpano.com/docu/xml/#control.touchtype
just set the one you want and/or add a button to change it
best regards,
Klaus