[Therion] Increasing Metapost 4096 scrap limit

I am getting close to the limit of 4096 scraps for Metapost which is mentioned in the Therion book and I have ran into it in some cases. It looks like this is a setting in Metapost that must be changed and not Therion, but I was hoping maybe others had ran into this and knew what modifications are needed to Metapost to accept more scraps. Thanks, Carl