Hi Stan
I am a BSc Mech Eng Undergrad at Oxford Brookes.
My final year dissertation is on using and Arduino board to control a 12V 20A brushed motor.
Naturally that doesn't mean find an Arduino shield, plug it into the Arduino and then the job's done.
It means 'produce an investigation worth reading'.
Part of the dissertation has been the evaluation of Free/Open Source Arduino simulators.
I downloaded this today and it is very good, well done.
The Fritzing simulator has superior graphics, but it comes nowhere near yours on the practicality front.
Thanks for the effort.
best regards
Paul Lancaster