Unfortunately, there’s no easy way to do this in honeybee-legacy without writing your own OpenStudio measure or editing code within the “Honeybee_Export to OpenStudio” component like this code here, which is where the People definitions are being created in the OpenStudio model using some of OpenStudio SDK’s methods like you see documented here.
Editing these extra properties should get substantially easier in Honeybee[+] when we release the next version this Spring since we will have a Python API that let’s you change the properties of Python objects themselves (before they are exported to EnergyPlus/OpenStudio). You will be able to do this simply using a GHPython component with a couple of lines of Python. For example, to change a the people latent load (which we won’t expose on any Grasshopper components), you just need to change the latent_fraction property of the People object that is assigned to your Zones. So things should be getting easier in the near future.
FYI, I would not recommend using EnergyPlus’s builtin thermal comfort models on the People object when you can control the inputs more finely using the “PMV Comfort Calculator” as you see in this hydra example.