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I am pretty sure you can move those items around if you don't mind editing the theme file. If you look at the theme file, you will see where the various blocks are called.
I believe it is safe to swap them around (ar the risk of confusing yourself later).
However, I think that once you call the center-left and center-right blocks they can only occur once... not at the top and then later at the bottom.
Or, at least it ceases to be easy after that point... still it is a start. I hope that helps.
In fact, the Spanish support site puts the center-left and center-right blocks above the rest of the content... using x2t theme.
http://www.esxoops.com/modules/news/