I think that there is a misunderstanding about what the user expects and that what the programmer did.
According to "Client.lua":
LRPaste = CU.fSimulateKeys(KS.KeyCode.PasteKey,true),
LRCopy = CU.fSimulateKeys(KS.KeyCode.CopyKey,true),
is in "KeyShortcuts.lua" translated to:
CopyKey = LRkeytoCode("$$$/AgLayout/Menu/Edit/Copy/Key=Cmd+c"),
PasteKey = LRkeytoCode("$$$/AgLayout/Menu/Edit/Paste/Key=Cmd+v"),
which is similar (if not identical) to Ctrl-C and Ctrl-V under Windows.
But in the development module we find "Copy settings ... Ctrl-Shift-C" and "Paste settings Ctrl-Shift-V",
according to the german resource file this would be:
"$$$/AgDevelop/Menu/Photo/CopySettings/Key=Cmd+Shift+C"
"$$$/AgDevelop/Menu/Photo/PasteSettings/Key=Cmd+Shift+V"
My personal preference would be the last combination because LRcopy and LRpaste are in the develop section and the develop module does not have a menu entry for Ctrl-C/V