I don't think you can control the point light?s falloff independently, but I could be very wrong.... Did you go to Pixar's Renderman forum? The big boys know everything and usually answer all kinds of questions, from simple to super-fancy... The forum is here: http://<b>https://renderman.pixar.co.../index.php</b>
But as far as I could guess... I'm not sure it's a point light
what you need in the first place, if you're doing what I'm guessing it is that you're doing (and my opinion is that you should definitely think well before using 6 shadow maps instead of 1). What kind of problems did you encounter with other types of light?