When I first started playing Kubb I took my throws from a standing position on the baseline, weight even on both feet. For no other reason than nobody told me differently. I had gradually been moving my throw lower and harder, and now I've adopted a step into the throw as well. I decided after the 2012 Nationals that I was going to officially work on throwing that way. I've heard it called the "Minnesota Step", I think in large part becuase Eric Goplin of Minnesota Kubb throws that way.
Here is a video of him throwin in that style.
For me I find that this style of throwing works better. However, you have to be ready to take a step back to hopefully get a better throw. Wind affects your throw less. In thight groupings you can bring more power to the hit as well.
Although, one trip to Nationals is all that is required to realize that there are probably as many baton throwing styles as their are players. Throw in the way that works for you.