Road & Track surveyed a number of automakers about how they set up their manual shifting modes. Some require you to push the lever forward to upshift, while for others that's a downshift, and a couple demand you move the lever side-to-side. The 13 makers examined all have their reasons, the loose consensus being that the forward-for-downshift bunch is modeled after driving dynamics, the forward-for-upshift bunch based on intuitiveness and customer feedback.
At least two makers have two cars that use different shifting methods. And if not for Subaru, Audi, and Porsche there'd be a nice way to classify the forward-for-upshift crowd as being for buyers who aren't into sporting driving. As far as we're concerned, forward should be for downshifts, and single-function paddles should be mounted on the wheel, not the column. But you can tell us what you think in the comments.
[Source: Road & Track]