Apple - How can I reassign the copy/paste keyboard shortcuts?

This worked great for me to serve just the cut/paste/copy features I use so often

System Preferences: Keyboard: Modifier Keys...

Then swap the Command and Control keys. This will change everything globally for all keyboard commands system-wide.

Try creating ~/Library/KeyBindings/ and saving a property list like this as DefaultKeyBinding.dict:

{
    "^\UF727" = copy:; // control-insert
    "$\UF727" = paste:; // shift-insert
    "^\UF728" = cut:; // control-delete
}

I don't have a keyboard with an insert key, so I couldn't test if the first two settings work. The last setting works for me though.

Edit: another option is to use Karabiner (formerly KeyRemap4MacBook):

<autogen>__KeyToKey__ KeyCode::PC_INSERT, VK_CONTROL | Modifierflag::NONE KeyCode::C, ModifierFlag::COMMAND_L</autogen>
<autogen>__KeyToKey__ KeyCode::PC_INSERT, VK_SHIFT | Modifierflag::NONE, KeyCode::V, ModifierFlag::COMMAND_L</autogen>
<autogen>__KeyToKey__ KeyCode::FORWARD_DELETE, VK_SHIFT | Modifierflag::NONE, KeyCode::X, ModifierFlag::COMMAND_L</autogen>