Did another tests with LIM mode activated using keepassx as test case: It works correctly when menu is displayed in the window title and the window is not maximized. When the window is maximized, the menu is displayed in the unity bar and it doesn't work.
Did another tests with LIM mode activated using keepassx as test case: It works correctly when menu is displayed in the window title and the window is not maximized. When the window is maximized, the menu is displayed in the unity bar and it doesn't work.