31 prim limit on physical objects

Just curious why there is a 31 prim limit on physical objects. Is it a resource issue? I wish it was closer to 100 prims. This makes building cool looking physical objects very difficult. Darrly Chang and I sell pet dogs that follow you around and do tricks. It's quite difficult to build a great looking dog with only 31 prims.

Plus we'd like to be able to sell accessories, like collars, dog clothing, etc, but there is no way to attacjh them to the dog without going over the limit. I made a bulldog that I really wanted to have a spiked collar, but there was no way without sacrificing the dog model details.