Un mejor lugar para preguntar es probablemente el foro de programadores https://stackoverflow.com/questions/tagged/osx
Pero de antemano creo que se pueden hacer algunas variantes diferentes de su .app
cada uno registrando su propia acción de Servicios. Esas variantes podrían lanzar tu aplicación "principal" para hacer el trabajo pesado.
Estas variantes podrían agruparse en la aplicación principal, como veo algunos ejemplos aquí:
/Applications/Adium.app/Contents/Frameworks/Sparkle.framework/Versions/A/Resources/finish_installation.app
/Applications/Android File Transfer.app/Contents/Frameworks/Breakpad.framework/Versions/A/Resources/crash_report_sender.app
/Applications/Android File Transfer.app/Contents/Resources/Android File Transfer Agent.app
/Applications/Android File Transfer.app/Contents/Resources/Android File Transfer Agent.app/Contents/Frameworks/Breakpad.framework/Versions/A/Resources/crash_report_sender.app
/Applications/Google Chrome Canary.app/Contents/Versions/26.0.1400.0/Google Chrome Framework.framework/Resources/app_mode_loader.app
/Applications/Google Chrome Canary.app/Contents/Versions/26.0.1400.0/Google Chrome Framework.framework/Resources/crash_report_sender.app
/Applications/Google Chrome Canary.app/Contents/Versions/26.0.1400.0/Google Chrome Helper EH.app
/Applications/Google Chrome Canary.app/Contents/Versions/26.0.1400.0/Google Chrome Helper NP.app
/Applications/Google Chrome Canary.app/Contents/Versions/26.0.1400.0/Google Chrome Helper.app
/Applications/Quicksilver.app/Contents/Resources/QSDroplet.app
/Applications/Stainless.app/Contents/Helpers/StainlessClient.app
/Applications/Firefox.app/Contents/MacOS/crashreporter.app
/Applications/Firefox.app/Contents/MacOS/plugin-container.app
/Applications/Firefox.app/Contents/MacOS/updater.app
/Applications/TextMate.app/Contents/SharedSupport/Bundles/ActionScript.tmbundle/Support/bin/XTrace.app
/Applications/TextMate.app/Contents/SharedSupport/Support/bin/CocoaDialog.app
/Applications/TextMate.app/Contents/SharedSupport/Support/bin/CommitWindow.app
/Applications/Xcode.app/Contents/Applications/Accessibility Inspector.app
/Applications/Xcode.app/Contents/Applications/Application Loader.app
/Applications/Xcode.app/Contents/Applications/FileMerge.app
/Applications/Xcode.app/Contents/Applications/Instruments.app
/Applications/Xcode.app/Contents/Applications/OpenGL ES Performance Detective.app
…