Thats not really something they can just up and alter, however more detail can be achieved by using multiple proxies, furthermore by using proxies you are able to add shadow LOD's to each one for a more detailed image overall.

It's too difficult to increase this limit. However our models are made in very high detail and has these limits. You can increase polycount by proxies as NodUnit said, but there are several problems with that, too.
You can increase detail eg. by using pretty CO textures and precise made material with all fx textures.