Achille,
I agree with your wish.
In the stacking order, see the "Display Order" in Archicad Help the program list objects 3rd.
Dimensions not being always on top although in the highest group is a big pet peeve and one that has caused problems when I've forgotten to select all dimensions and place at the forefront.
How about making this into a wish?
Erika
Architect, Consultant
MacBook Pro Retina, 15-inch Yosemite 2.8 GHz Intel Core i7 16 GB 1600 MHz DDR3
Mac OSX 10.11.1
AC5-18
Onuma System
"Implementing Successful Building Information Modeling"