'Import Wizard' is grayed out for Salesforce and other Business Intelligence connections
When connected to a Business Intelligence data source such as Salesforce, the Tools | Import Wizard is grayed out.
BI connections are read-only
It is not possible to create tables and views or new columns using Toad. You cannot import data into a Salesforce.com data source from Toad.
To read further about considerations and limitations when connecting to Salesforce, please go to Help and search for "About Salesforce.com Data Source"
For general considerations and limitations when connected to a BI source, please review the Help Chapter - "Query Business Intelligence Data Sources | About Business Intelligence and NoSQL Data Sources"