If anyone can't see the double feat tree can do the following,
go to Funcom\Age of Conan\Data\Gui\Customized\Views\MainGUI
and delete the MainSplitView.xml
also delete the Funcom\Age of Conan\Data\Gui\Customized\Views\FeatGUI
this should work and after you can see double feats with the default feat panel.
p.s. propably this works with other customs Guis if they have same problem.