I will repeat myself again the umpteenth time.
Properties is showing active object porperties until you pin the context.
By creating an editor dedicated to a force field and an other one dedicated to particles, I don’t have to change selection each time, I want to tweak a setting influencing my simultation.
Properties editor does not only contain the Render Button.
There is already a shortcut for one step operation allowed by this editor like choosing a parent, adding a modifier, etc…
But having Properties as an editor make sense for lots of things that will take several steps to set-up and need a 3Dview inspection.
Your design make no sense the way blender is actually working. You have a bigger 3DView but it is unused.
You want to set-up a material through material properties tab -> The tab is overlaping the 3DView where you are supposed to look impact of these changes.
You want to set-up particles through properties tab -> same problem.
You want to set-up a freestyle Linestyle -> same problem.
You want to mix Shapekeys of your mesh -> same problem.
You want to set-up Cycles Geometry or Sampling panels settings -> you will have to open/close Render tab at each test.
I stop here.
For particles, freestyle, blender 2.8 will give ability to tweak things through nodes.
Making an UI for node-editor would make sense. It will preserve the ability to create several node editor to inspect nodetrees of several objects at the same moment.
But this idea that when you are pushing a factor in properties, you are not looking at 3D View, at same time : it is not the reality.
Think about it. You don’t work this way.