Forget the SA account thing.
Just use a speed dial and put on a button.Works like this: you are on line talking to a cust, Press TRANSFER, Press speed dial button, wait till you hear ring back and hang up. If you need to supervise call wait for them to answer.
If your are talking to them why involve the Intramail??? That would just be an extra step. If you have Call Transfer on your lines you put FF in front of the number and don't use the Transfer key.
Use the buttons at the top of the phone for speed dial.