I was able to do the follow to connect a JDBC client with SQL Developer through a socks firewall on a Windows 7 machine.
1. You must have admin rights to the Window 7 machine.
2. Shutdown any SQL Developers currently running.
3. On Windows 7 Navigate to SQL Developer "exe" Directory C:\Program Files (x86)\Oracle\SQL Developer\ide\bin.
4. Backup file ide.conf by copying ide.conf to ide.conf.backup
5. Add the following to the ide.conf