to be a little bluntly honest I really prefer orion's current default behaviour as with any other browsers I find it very annoying when for example I open a forum then apple-click the various threads that seem interesting and I too often have to stop partway through the forum to look through the tabs I had open .. because if I try apple-click too many, the tabs end up being very difficult to use because for some stupid reason the close button is still a nice 30px wide box but the actual clickable tab itself is like only 5px wide making it too easy to close something instead of actually jumping to something
but with orion I now can happily open fourty articles and still know what was actually where right away thanks to the tabs staying at a rational minimum title-showing size all the time