What I usually do when I need to use RANDOM, is to seed it with a 16 bit timer value, and then add a few other variables I've got around and always tie grabbing that random number with some sort of human interaction.
If you've got an event that relies on human interaction somehow (i.e. button press) and a tight loop somewhere, there ain't no way you're going to get a continuously repeatable result.
True, RANDOM in PBP isn't all that random, but when you start adding the 'YOU' factor to it, you can get decent results...