I don't think that feature is coming back.
If you want to change it and make it more secure, use the source, add what you want and use your own custom build.
- That Whatsapp Inc. will have all your contacts and use the data in some way? Then don't sync ever again, use only pushnames.
it's weak as any other chat protocol with default protection. I'm a beginner and I can easily intrude into many GTalks, XMPPs, Facebook Chats and profiles.
So chill and don't expect a privileged treatment, I'm not getting any, so what makes you think you will? Peace, over and out.