Hi
Do you mean default plug in preset as in a set of master section plugins to be loaded with pre-defined settings?
You can actually already do that: Load the master section with the plugins at settings you want for the default … save as ‘Default’ or (what ever you want to call it) and it’s a one click reload.
Or do you mean a default setting for specific plugins when they are inserted? In which case most quality plugins allow for user defined ‘default settings’.