I want to order my Sales Order and Quotations screens by Customer (versus by Order Number).

Is it possible to make such a change without creating a custom module? For example by editing the action (using the developer mode)? I see that I can easily change the default amount of items shown (limit = 80), but I can't find how to change the default sorting order.

I managed to add an extra field (untaxed amount) to the view by editing the TreeView XML and I would assume it would be possible to change the default sorting in a similar way.