KImageMapEditor, dock widgets and Qt4...

Hi,
I managed to compile all KDevelop and kdewebdev.
In its current state in svn, KImageMapEditor crashes at startup. A problem at 
runtime in a Qt3 compatibility class, KParts::DockMainWindow3.

Instead of loosing time to make it work, I decided to migrate all dock widgets 
to kdelibs4/Qt4. But I saw that KDockWidget are not present any more in 
trunk. I thought that it was because Qt4 widgets provided enough features and 
that a KDE version was not needed.
So I updated KIME to use QDockWidgets. KIME runs now but... Impossible to dock 
several widgets at the same place. It does not create tabs like with KDock 
classes.

My questions are:
- Are there plans to write KDock classes for KDE4 ?
- Will Qt widgets evolve and allow 'tab docking' ?
- Have one of you met the same problem that I ?

Thank you,
Eric