Me too. I found myself wondering what does the controler actualy expect from me aside from the known limitations.
For example in the descent page we are SOP'd to follow whatever ECON is at the time but comming into ORD after a long haul and light weight it gives you .779 / 256 and that I would think be silly cause other traffic is planning a 300 kts descent and here I am holding everybody back.
The ECON also give you a sort of a shallow descent.
Just wondered
TC