It is very good that you posted, now you know that you only have to wait for 9.1 to have the feature you wanted, and 9.1 is not that far away.
OK, now here's how to make LXDE not manage your desktop anymore:
right click the desktop -> Desktop settings - > uncheck the "Manage the desktop and show file icons" checkbox -> OK.
If you wish to have LXDE manage your desktop again, the right click menu will not be available anymore, so go to Applications->Preferences->Desktop Wallpaper and check the above checkbox.