FWIW I use a script that deletes all channels and paths at once:

#target photoshop
app.bringToFront();
var theImage = app.activeDocument;
theImage.pathItems.removeAll();
theImage.channels.removeAll();

On 17-Feb-12 02:11, Jonathan Penzner wrote:

By the way, wouldn't it be nice if, in Photoshop, you could select all the paths or alpha channels at one time and drag them to the trash? I often receive files with dozens of paths and deleting them one at a time is a pain.