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It will be better to disable also "scroll wheel" only. 
like "scrollwheel = false" on map.

In Chrome, this works (with jQuery). FireFox seems to ignore me whatever I say.

$('#streetview canvas').bind('mousewheel', function(){
    return false;
});

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 Issue 2471  has been merged into this issue.

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How do I start test this using 3.3? Is there a query string for version?
I have scrollwheel: false in my panoramaOptions but streetview still catches the scrollweel. I assume this is fixed but not live yet in http://maps.google.com/maps/api/js?sensor=false

I use the below jquery-javascript code to work around double click zoom in my panorama - pretty sure it could be adapted to scroll wheel zoom. zoom: 1 being my prefered zoom stage here, but could be anything.

$("#panorama").dblclick( function(){

panorama.setPov(  { heading: panorama.getPov().heading, pitch: panorama.getPov().pitch, zoom: 1 }  );

});

Not really johannes, it is catching the scroll event that is not implemented in web browsers consistently. One browser's mousewheel is another's DOMMouseScroll. I could use your code to disable zoom altogether. 
I went trough the maps implementation. However once the code went trough closure compiler, it is no fun reading.

Anyway, this issue seems to have been fixed to an extend that "scrolwheel: false" would make sure zoom is no longer triggered on mere scroll. However the mouse is still caught, which is inconsistent with the maps implementation.

Good test case could be actually my page http://www.flatmaterooms.co.uk/room-to-let/london-princes-av. There you can see both: the map and the streetview as you scroll down. Both of them have "scrolwheel: false". However only the streetview would still catch your mouse as you scroll over.