Where is the Drafting Tools Properties dialog and how to set the default symbology settings?
The Drafting Tool properties are located under the Element > Detailing Symbol Settings menu. Once the settings are set here, these will be the default settings for any of the Drafting Tools when used.
http://communities.bentley.com/products/microstation/w/microstation__wiki/13857.how-do-you-create-or-edit-a-detail-symbol