The Quick Access Toolbar modifications CAN be shared and can be stored in a document or global template.
Modifying the Quick Access Toolbar (QAT) in Microsoft Word

For code to insert Building Blocks, see:

• Using VBA to Insent an AutoText Entry or other Building Block and
• Manipulation of AutoText w/vba by Greg Maxey

Other ways to insert Building Blocks include:

• Building Blocks Gallery Content Control and
• Build & Deploy Custom Building Block Galleries by Greg Maxey