This feature is not officially supported.
https://bitcointalk.org/index.php?topic=395721.0 option can be used if you manually modify the config file, however, the risk of messing up the S4 is too high. (Most of the config file mistakes can be reset via factory reset)
https://bitcointalk.org/index.php?topic=395721.0 should give you some insight how to do this step by step!!!
Yes, you can do so, but you have to log in to S4 via SSH.
You haven't answered HOW to do this. What to modify. Which settings to change.