[xwiki-users] 1.5 - Layout preferences for a user / a skin ?

Hi all, I customized my user profile, added a property ('leftPanels') to be able to define a list of panels specific to my user only. This worked nicely as expected. I wanted to do the same to define a personal layout, so I added boolean properties "showRightPanels" and "showLeftPanels" in my profile, but this has no effect on the layout. I also tried to add these layouts properties to my skin page, with no effect either. Am I doing something wrong, or is it "normally not possible" ? Thanks & Regards, Jeremie