That's curious, I always felt that landscape mode was holding it sideways.
Funny about different perspectives, isn't it?
Don't need to "root", hack it, install other launchers to do this simple thing. Unless you're just driven to hack the thing into submission. Just install the app "ultimate rotation" from the play store and you're good to go. Have also heard good things about Auto Rotate Widget.
Unless of course you're in to finding the most complex and risky solutions to simple issues, as so many on this forum are inclined to do.
So Nova pretty much does rotating for me on home .
Is there any way to rotate the lock screen without root?
Ultimate Rotation Control does it, no root required.