Super+0 shortcut behavior and Dash icon size

I have a couple of questions about the Dash. Both of these options seem like fairly natural choices to me, so I’m curious about the reasoning behind the current behavior.

  1. Is there a reason why Super+0 doesn’t launch the 10th favorite application?
    Super+1 through Super+9 launch the corresponding favorite applications, so I was wondering if there is a particular reason why Super+0 isn’t used for the 10th one.

  2. Is there a reason why the Dash icon size isn’t configurable?
    I’m curious whether this is mainly a design decision, or if there are other considerations behind keeping the icon size fixed.

I’m mostly interested in the reasoning behind these choices.