Welcome Felipecpc,
Triggering ST to load different settings is possible!
I still have to put this in the help pages somewhere, but you can find a description of how to do it here:
viewtopic.php?f=16&t=308
and here:
viewtopic.php?f=16&t=25
The first link describes how to do this for travel announcements (an RDS feature), but you can use it for anything Stereo Tool setting. The 2nd link is elaborates more on that, but might be a bit more confusing to read because that's the thread where someone asked me to include this feature. DON'T download the version that's linked from there - it's a VERY old version, and this feature has been present in all the versions since that version.
By the way, something that's not mentioned yet in any of these posts: For certain settings (Pre Amp for example), changing the setting suddenly would cause annoying effect, because of that the slider is actually moved to the new value in a few seconds.
Hint: To make sure that the new settings aren't being read while you're still writing them: Create the file with the new settings using a different name, and then rename it.