Hi to all.
Please note that every wish for application's developments that you are asking is not simple to apply. (Sorry for my bad english)

Whatsapp (Official App) is developed by a team of developers with the means and resources necessary to carry out the development of applications. AND are paid for it !!!!!

Whatsup/Wazapp/Mitakuuluu2/ are developed by a few passionate developer or ONE who take their time and patient to produce an equivalent soft has a great team. And are not paid for it but work hard on IT.

Whatsup / Wazapp / No longer maintained and Coderus working alone on Mitakuuluu2 for sailfish which is pretty difficult thing !!!!!.

If there are dev. motivated and interested, it can still be used sources Wazapp or portMitakuuluu2 on Nokia N9. Also make a clien from scratch!

I give help. I am young develloper (Still learning ).
So when your asking somthing, be patient. ^_^