Hi Scritz--
I'd have to guess that Aluminum is the default wire Material when creating a new wire Type because Aluminum comes before Copper alphabetically! I have put in a request to make Copper the default.
The reason objects aren't removed from a circuit when deleting wiring is because wiring doesn't define the circuit... it is annotation. There are many designers that are in the practice of not showing wiring at all... that is why the workflow of creating and deleting wires has no effect on the circuit property of the object.
With regard to the Basics / Electrical Design Bars, you may note that everything on Basics is repeated elsewhere. This Design Bar merely lets you lay out multiple object types to create a quick multi-discipline layout. If you don't find this Design Bar useful, you can hide it (right-click in the Design Bar area).
Thanks for the comments!
Martin Schmid, P.E.
Autodesk Consulting
Martin Schmid
Product Line Manager
Mechanical Detailing and Electrical Design
Architecture, Engineering, and Construction
Autodesk, Inc.