Just as in Sibelius and particularly in galley view, little translucent bar numbers attached to every staff would be great assisting tool in oder to avoid getting lost inside of large scores with many staves to scroll over.
Dorico currently offers only one level of translucent bar numbers, and they copy the staff position designated for regular bar numbers.
On a thoroughly positive note: the graphic output of Dorico is really AMAZING, by the way. 