Portrait seems to work better than pivot pro. Also realize that these screen rotation programs only rotate windows apps. (Even though Lazarus doesn't look it, it is merely a standard Windoze window.) What this means is when you launch the game, you generally have to rotate the emulator too, using it's rotate switch. And yes Lazarus does force the resolution, but if you go into the settings you'll notice you can set the resolution to anything you want, that includes changing the aspect ratio. You'll probably need to make your own skin though, as stock one's are going to be distorted.
I've tried to make Lazarus more compatable with vertical displays, but quite frankly I don't have a vertical monitor and I haven't found anyone with one that's willing to beta test for me on an extened basis. If I did then I could make it run better with portrait, pivot pro and the lot.