Is there a need to select all the files before calling auotpano ?
That's certainly a good question. I tried it and the answer is yes !
Autopano will not automatically scan the folder for other images. The reason is that there might be hundreds of other images composing different panos in the same folder.
In fact, once in autopano you can dig into some commands to actuallly search and load the other images but that defeats the purpose of selecting the images within MC. I could better just launch autopano on its own for that.
BTW I tried your suggestion of using autohotkey with #singleinstance for autopano but that does not really work.
What it does is to open a single instance of autopano (what I'm seeking) but loads each file in a separate pano project instead of a single one which give even more work to assemble the images.
But I have just discovered autohotkey after reading your post, so I'm a real newbie here.
Anyway, I really think that an option in MC to open several files with a single instance of an external tool as requested by the Original poster, would really be useful here.
Thanks and have a fine week-end,
-C