It kind of bugs me that the trash tree expands every time I want to put something in it. Can this be changed? Perhaps the spring-loading could be extended…

This is default OS X outline view behaviour. This is how all outline views in Cocoa apps work (i.e. I didn’t program this behaviour, Apple did).
All the best,

And, using the key to move things to the Trash instead of using the mouse will not expand it, by the way.

Ah, I see. A bit like the drag and drop delay.

Thanks AmberV - great tip.