@ Saturn, digitalvoid.
You can add option, that application is protected by password (you must type password to unlock it) and don't create icon in menu, but if you want to open this app you must go to terminal as a root and typ "run smscon" or something. I think it is a better solution, becouse if your n900 be stolen thieft can found this app and switch it off.

I think You understand my english ;p