In SpawnerCreature.spawnEntities changes were made to calculate the moblimit based upon the spawnRadius instead of a hardcoded value of 8. When retrieving the value of mobcnt and then setting moblimit, the magic value 256 is used for a division. Let's name that value spawnArea. This division is scaling back the limit after adjusting it by the number of chunks to account for in the calculation. It is calculated based upon the area of chunks around the Player which were added to the LongObjectHashMap b. -8 to 8 is 16 which is then squared to achive the spawnArea, 256. Using the new spawnRadius calculation would now require that this spawnArea also be dynamically calculated so the scaling is correctly preserved. I saw it last night while looking over the source code changes for 1.4.4.