I agree on that, it can become a nice feature. I tried your suggestions, but I could not load anything directly on a track, nor on a regionslist(protools). I had a few workarounds, which is better than the way I used before, but a direct drag and drop would be still preferable, so if anyone found a solution to that then please let us know. My workaround in protools is as follows (did not check cubase anymore, but I bet it will work in a similar way):

Biab:
For audio:
In protools choose "import-> audio" under the "file"menu, and drag drop the files into the left screen. Press "add files", "done" and select your audiofolder (probably it will be current folder, since you created a protools file already and you want all your audiofiles being together) . Then either add them to your regionslist or create new tracks for them.

For MIDI:
I chose not to use seperate tracks. That way you only have to import once. (select that option under "options for DAW plugin") Protools will change them into seperate tracks again.
So again: "file"menu-> import. then of course "MIDI", drag and drop them in the window you chose. On import it will create seperate files for each track/region.

For realband I did a quick check too:
Here unfortunately do not have the possibility of dragging the "combo" so you need to drag/drop/import each MIDI track on it's own. Audiotracks have to be dragged one by one too, but can be imported all at once, so no need for doing the same thing several times. The dragging and dropping here works by grabbing the tracknumber and drag it over.

All in all, certainly worth looking at it again by PG music to make it work easier, if it really has to be done this way.

Ironic part of it all is that I changed my settings depending on how I wanted to drag/drop (as MIDI or wav) in the DAW plugin options, but the the plugin did not need to be activated, since it works the same. So if the only function of the drag drop option is to make the window smaller and keep it on top, then wellllll... Need to say more?

I'll be back...