when contraining you are not always sure what is what so you can use pick part first but when using this if you pick something it does not highlight in the browser. You also cant switch or use part priority whilst this dialog box is open. So you have to either mouse over everything in the browser to find what you are looking for then drill down to the part you want or close the dialog so it will highlight in the browser when picking an assembly. The way I see the improvement working is that part priority would work and can be swithced whilst the dialog is open then say you pick a part in a sub assembly it would find, expand and hightlight the part in the browser. Also sub assembly priority would need to be added.