Simply putting a trigger zone on the same tile as the player start marker will ensure you can trigger any FPI script you wish. Within the FPI you can do anything any other FPI script can do, after all, it is a mini programming language. Steal some code from the setuplevel.fpi and paste it into your own FPI script and see what happens after changing some values or filenames around. I recommend using the USER folders to store all your own work so you do not modify the original files and keep all your work in a predictable place.
"We are the knights who say...eki eki eki fatang loopzoing, zanziga....ni"