@Luca Castellone: Thanks for your suggestion.
We will see, if more people ask for this.

Hi!
Long time FileZilla user recently migrated to WinSCP and until now very happy.
My only issue is operation to perform on double-click doesn't work for folders (it opens the folder instead of copy).
Relevant settings:
User interface = Commander
Explorer style selection = Mouse and Keyboard
Keyboard shortcuts = Explorer
Operation to perform on double-click = Copy

It works for selection of:

• one or multiple files
  
• multiple files and folder, where last selected item is a file
  

It doesn't work for selection of:

• one or multiple folders
  
• multiple files and folder, where last selected item is a folder
  

In these cases it opens the folder.

Thanks. It's located in a different spot in WinSCP 3.7.4 – the "Environment" tab, but I found it and now have the behavior I want.

See option Operation to perform on double-click.

On my previous machine, I was running an older version of WinSCP, and I had it configured so that the return/enter key would initiate a copy.

I have moved my work to a new machine and installed WinSCP 3.7.4, and I haven't found a way to set it up so this works. Instead, return (or double-click) tries to open the file using whichever program is configured to handle that filetype. This is almost never what I want to do.

I tried switching to F5, but that always brings up a confirm dialog.

Can I please have back the ability to copy a file from the local to remote host (or vice versa) with a single keystroke? Preferably "enter"? Is this ability hidden somewhere that I'm not aware of?

In case it's not obvious, I'm using the two-pane "Norton Commander" interface.