I recently asked the same question and got the following reply from Daniel:
The plan for accessing Properties via keyboard is to have a popover that allows you to type the start of the property you want, then jump straight to it. For some properties that are used more often, it probably makes sense for us to expose those properties as commands proper, as well.
I wonder if we will eventually have a popover that lets one type in a voice number, perhaps with an “s” or “e” to indicate start or end? It might even be triggered from the SHIFT+V key-combo.