Currently, in the Add/Edit window, we have the choice to Show Empty or Hide Empty.
In practise, I would always like to have Location showing when adding or editing, so that I can enter it, but would like most of the other empty fields hidden so as to avoid clutter.
It would be nice to have the option to always show certain fields.
One could get some of the same effect by setting some fields not to appear at all in the window, using the preferences. But it isn't exactly the same effect.