I've been wanting more functionality for the VST/Effect editor window for effect routing or assignment. Could be added in the Info > Outputs or a new one.

The scheme of the feature is add new menu options as follows:

VST/Effect editor window

Info
  |
  ---Outputs
      |
      [its current assigned output]
      |---separator---
      |
      Output to new plugin... (opens a new window to select an effect/instrument, adds them to the next available slot) 
      |
      To slot > (defined plugins [like the effect list where you assign a plugin to a channel)
      |
      To custom slot > (lists all available slots, like the effect list where you assign a plugin to an instrument [and maintaining its behavior of select new plugin if it's empty])

This way I think it will improve VST/Effect and work flow while is the future plan for modular view.