Have you checked the PL/SQL Developper from Allround Automations? That's a really great tool including debugging in procedures/functions/packages/triggers/....
This is not yet possible, but we've been thinking about this. It would be nice to step from the Delphi/C++Builder Debugger into our PL/SQL Debugger. Maybe in the next release...
------------------ Marco Kalter Allround Automations