Thanks for your reply, Sam and Pierre.
 
Now I understood because Ctrl+dLMB, on a clip, works so, and you all, surely, knew it. It use the same behaviour for the two mode “Drag and Drop editing mode” and “Cut and paste editing mode” and that is for good coding performance, I think. Then, if it is for coherence/consistence, as Pierre said,  then I accept the new behaviour (I really like coherence), even though, as Sam said, we could save a Ctrl key. I before asked "only", if possible and more users (and Developer/s) agree with me, to reverse the Ctrl key behaviour in "Cut and editing mode", without changing the base code.

I would like to add two suggestions for “Drag and Drop editing mode”, if GG/Phyllis and users, think useful like me.
1) In Timeline, when we move a clip (without select it before) a icon is showed over. Would it be possible only to show the white frame without that icon?
Look at the added screencast from 0" to 8" https://streamable.com/p7sps
2) In Timeline, when we move a clip/s/group/s with drag&drop, if Ctrl key is pressed before drop then, a little "copy" icon is showed and a "clone" (Copy&Paste) could be performed instead of the Move.

Thanks.
IgorBeg