Источник для Jumpcut (который я никогда не использовал) доступен, так что вы можете изменить fakeCommandV в AppController.m чтобы определить, когда он вставляется в Emacs.  Я очень легко проверил следующее.  Мне также пришлось внести несколько несвязанных, но незначительных изменений, чтобы заставить его скомпилироваться на моем компьютере (10.6).
-(void)fakeCommandV
    /*" +fakeCommandV synthesizes keyboard events for Cmd-v Paste
    shortcut. "*/
    // Code from a Mark Mason post to Cocoadev-l
    // What are the flaws in this approach?
    //  We don't know whether we can really accept the paste
    //  We have no way of judging whether it's gone through
    //  Simulating keypresses could have oddball consequences (for instance, if something else was trapping control v)
    //  Not all apps may take Command-V as a paste command (xemacs, for instance?)
    // Some sort of AE-based (or System Events-based, or service-based) paste would be preferable in many circumstances.
    // On the other hand, this doesn't require scripting support, should work for Carbon, etc.
    // Ideally, in the future, we will be able to tell from what environment JC was passed the trigger
    // and have different behavior from each.
{
    NSString* app = [[[NSWorkspace sharedWorkspace] activeApplication]
                     objectForKey:@"NSApplicationName"];
    NSLog(@"Current application: %@",app);
    if ( [app isEqual:@"Emacs"] ) {
        NSNumber *keyCode = [srTransformer reverseTransformedValue:@"Y"];
        CGKeyCode yCode = (CGKeyCode)[keyCode intValue];
        CGPostKeyboardEvent( (CGCharCode)0, (CGKeyCode)59, true ); // Control down
        CGPostKeyboardEvent( (CGCharCode)'y', yCode, true ); // Y down
        CGPostKeyboardEvent( (CGCharCode)'y', yCode, false ); //  Y up
        CGPostKeyboardEvent( (CGCharCode)0, (CGKeyCode)59, false ); // Control up
    } else {
        NSNumber *keyCode = [srTransformer reverseTransformedValue:@"V"];
        CGKeyCode veeCode = (CGKeyCode)[keyCode intValue];
        CGPostKeyboardEvent( (CGCharCode)0, (CGKeyCode)55, true ); // Command down
        CGPostKeyboardEvent( (CGCharCode)'v', veeCode, true ); // V down
        CGPostKeyboardEvent( (CGCharCode)'v', veeCode, false ); //  V up
        CGPostKeyboardEvent( (CGCharCode)0, (CGKeyCode)55, false ); // Command up
    }
}