The emoji set used in Whatsapp is not part of the Unicode specification for japanese emoticons. In Whatsapp an emoji is like 0xEE 0x80 0x85.

Maemo doesn't allow me to put icons in the Windows title name (where the subject is) so you can start forgetting about that.

Also, I wonder how did they manage to put smileys in the subject? Because I have an Android and I just can't.

About the arabic keyboard, I have no clue how to fix it. I just use QTextEdit from Qt. I wonder if that also happens to you in other Qt applications. If it's a bug in Maemo Qt, we will never see a fix for it.