As it is, with e.g. Material traders only showing up in systems with between 1 million and 22 million population, being unable to include population size in the filter makes it more difficult to find material traders than it has to be.
Also, please let the population min/max slider show the actual numbers it filters on in addition, not just showing sliders where the player have to make a guess at how large a population or small the min/max slider indicate as no numbers are shown in the current version of Elite: Dangerous.
Also, please let the population min/max slider show the actual numbers it filters on in addition, not just showing sliders where the player have to make a guess at how large a population or small the min/max slider indicate as no numbers are shown in the current version of Elite: Dangerous.