Right. Do you really think that Avidemux should behave on drag'n'drop the same way as when loading a video using the filepicker?
I think it depends on workflow habits ;-) Personally I rarely use Ctrl-O dialog to open a file. Here is how I work:
There is a small explorer window on the right side and 10-50 files in a folder that I need to cut. I drag them one by one and save as source_cut.mp4. Then press Ctrl-W and drag the next file. Since the files source.mp4 and source_cut.mp4 go one by one, I always see what file should be dragged next. When I need to join videos, I do not pres Ctrl-W and drag several files one by one and they become automatically merged (Append function works here). So, drag and drop seems to be the fastest and easiest way of dealing with many
files, so I think drag and drop should behave exactly as Ctrl-O with a single file and Ctrl-A with multiple files to avoid confusion. Of course, if I need to work with one file only, it would be faster to use Ctrl-O but if explorer window is already opened in the right folder, I would prefer drag and drop anyway.
As far as the command line is concerned, I never used it. Maybe you are right here and it should not interfere with GUI features because Ctrl-O and drag and drop are GUI features and command line is not.