Well, aesthetically I would consider vertical text to be a disaster, especially when there would be more than one button on that area. It is not a scalable solution anyway.
You don't want to do a design where the total width of the available content area on the left would depend on the amount of buttons on the right (where each new button would make the available area slightly narrower). There can be cases where the content presentation on the left is the same for multiple dialogs, possibly with different amount of buttons on the right.
This SDK represents the first *public* alpha release of the Maemo 5 UI, but such UI has gone through an extensive period of development and testing, including user testing and specific usability testing. Briefly said, regular users were happy.
Does this mean that the doors for feedback are closed? Of course not, but this doesn't mean that we will automatically accept the conclusions made in this thread based on (screenshots of) straight Diablo / Linux desktop ports in an SDK. ragnar and I are providing arguments about why we think the changes are good.