I very often make a project with a resolution several screens big and move layers in and out of the slice via position. It's often a better solution than sending a single layer to a slice. That rolling transition is one of the better ones for logos and such. It certainly would nice if we could scale and move layers around and have them look right when on autopilot. I haven't looked yet, but I'd guess some of the other transitions look wonky too based on your description. The whole point of resolume for me is that you don't have to have things "in the can" you can create on the fly.
I can get the effect I want by setting up a logo layer with autopilot and blank frames between each logo to get rid of the alpha effect. Then using the layer router on another layer to move and scale the result around the screen, but what a pita.
Oh hey, if we could have a toggle to see the cropped and masked slice outlines on the output monitor that would be wonderbar.