Can "append to clipboard when shift is held down" be disabled?

Nov 6, 2014
In TC23, the Win10 setting for "Use Ctrl+Shift+C/V as Copy/Paste" was respected.

I finally moved to TC26 and was surprised that Ctrl+Shift+C would append to the clipboard. I see that the behavior is documented as having been added in v25.

I'd like to disable that behavior. Assigning "Copy" to "Ctrl-Shift-C" in the TCC/Keyboard options dialog doesn't do the trick.