You're welcome Greg and Deborah. Greg, I wouldn't mind knowing also about these fancy mouse moves of yours This method is okay, it helps, but its limited to working only on consecutive emails. It doesn't work so well on search results.
Clare, I tested the Preview Pane today and I think I'll keep it. It seemed I scrolled a lot less using Preview Pane.
Sorry, mouse gestures also work with consecutive emails so no help there but here is the link to the mouse gesture app I use: