The 0.01% left is made of unusual cases like for instance if you want your application to be installed in the Applications folder of the root home directory (but this is just an example). For the other 99.99%, just distribute your application inside a Disk Image and inform the user in the Read Me file he/she just needs to move the file into the Applications folder to install it. You can also use the background image of the Disk Image to provide instructions to the user.