This request is similar to this one for the JDBC driver which is under review:  https://community.progress.com/community_groups/products_enhancements/i/datadirect_connect/provide_an_option_for_proxy_authentication_for_oracle_jdbc_driver.aspx

Oracle provides a feature to access the database resources by a behalf user by giving specialized privileges to the user. The existing ODBC driver does not leverage this feature. Add this feature as an enhancement to the current driver functionality.