Right now players have to do either some awkward backdoor method (going into mission.sqm and changing classnames), or download a mod someone has put together (that is usually missing some structures, or building features e.g doors don't work), in order to put down clearly ready-to-place objects in the editor.
This ticket is a request that you support this officially and add all of the placeable structures under appropriate categories within the editor.
The objects are great and allow mission makers to add much more variety to their missions. From the mods that people create* it shows that the objects are in a form that are ready to be used, so it begs the question why they're not in the list from the get go?
*mods such as:
http://www.armaholic.com/page.php?id=19526
http://www.armaholic.com/page.php?id=19650
http://www.armaholic.com/page.php?id=20427