It is now possible enable 5 x 5 rows and columns on the Note Edge by modifying the stock launcher. You must be on Android 5.x lollipop to use this patch. We have tested it on stock rooted odexed and Thunderbolt firmware. This is how your launcher will look like after applying the 5 row patch.
It is sad that Samsung did not enable 5 x 5 on the Note Edge. Even the Samsung Galaxy Note 3 has 5 x 5 launcher. Nevertheless with this XDA patch you will be able to enjoy 5 row launcher on it.