Existing templates will not change, but I do like the idea of being able to choose which package should be selected by default, if any. I'll discuss with the team on how best to implement.
One issue though is with the AJAX type of order forms, a Package effectively has to be selected by default, otherwise none of the content below would be able to load.
One thing I really want to do, but will take some work, is to add the ability to "save cart", this would generate a link that you could publish or send to a potential customer that would drop them into the order form exactly where you saved it at.. with things pre-configured. There's a lot involved with this, so it will probably be a while. In the meantime, there may be some other options we can add that can be passed in to the order form.