would it be possible give us more informations on the status of this module
I'd guess that it's maybe 85% complete at the moment. There are still a few types that need implementing fully, and I'm also keen to add some helper functions to make it easier to use pixmaps with some of its built-in image stuff - like for rendering a pixmap in a particular window. (but I guess that is add-on functionality).
Do you have plans on improving their tools?
I've started a port of the "skin" editor to BlitzMax. As you've found, it isn't very intuitive. The use of a grid/sheet instead of a property grid doesn't help much either. Why BlitzMax instead of C++? Well, I think better in BlitzMax... and it's much faster for me to knock out code in it.
Once the basic code is working, then we can look at improving upon it.