Yup, turning the Compressors' Mix slider to 50% will add parallel compression... but there are a couple of benefits to the way I detailed:
1- You can adjust EQ (which is what logicluvva and Olav Basoski mention) to the overly compressed signal. Very cool way to bring out the highs/lows, etc.
2- This method should be similar to follow for those using other DAWs... :)
But, good points... might do a follow-up to Compression, either Parallel or Serial, or something else...