I appreciate your help.
But now i have to press a key combination instead of a simple <INSERT>.
I'm using <INSERT> since 30 years in file commanders, never used the mouse for selection,
only for actions which you couldn't do with the keyboard, like Drag&Drop to external programs.
And it is not logical for me to let the file(s) selected after dragging. When you select file(s) you want
to do an action with them, like copy. After copying the files you expect them to not be selected anymore.
(I know that some tools have an option to let files selected after some actions. Useful, but only when you want
do multiple actions with the selected files.)
The same goes with Drag&Drop, if i select file(s) to do the "action" Drag&Drop, i expect them to be unselected,
because the "action" is done after draggin them.