@Scorpius - just some random thoughts: AIUI(judging from the system menu plugin) this is a standalone application not integrated with n900 messaging system. But AFAIK Qt plugin could be integrated with it without much of a hassle. Is there anything (besides your decision to share your watsapp test application in the state it is so far) preventing such an integration.

Note: I am not using/will not use Watsapp and not really interested in the way it will develop.