Currently, I can't change the mass units independent of the length units in modeling. For example, I can't set my length units to inches and view the mass of my model in pounds. Simulation has a variety of measurements with different units that can be changed in Preferences, but those units don't apply to Modeling or CAM, etc. Also, there is a different set of units for how properties are displayed for Physical Materials.
We should have a consolidated and comprehensive set of units that can be set in the Preferences that apply to entire application, then allow me to override the units for each possible measurement in the context of each workspace. For example, let me set my application Preference for mass = g, but then in the Simulation workspace let me change mass = kg.