Theres only one type of default track you can define, and you wouldn't want that plugin on every new track, but what you could do is create a toolbar button to add that plugin to all selected tracks. It would be three clicks after importing MIDI (select first track, shift select last, press button).
You would use SWS to achieve this:
Just customize a toolbar and put that action in it after saving your chosen playback plugin as an fx chain and setting it up in SWS Resources > FX Chains as above.