Sensitivity of mouse in the folder tree

Can the sensitivity of the mouse in the folder tree be adjusted? When I select a folder to view, if the mouse wiggles just a bit, DirectoryOpus thinks I am trying to copy or move the folder onto itself. This is getting worst as I get older.

There's a Windows setting you can adjust that specifies how far you have to move the mouse before a drag & drop starts.

It used to be configurable in the Mouse control panel but Microsoft, in their wisdom, removed it from there, so you have to configure it via the registry these days:

You may need to restart after changing it.