Hack: Toggle vertex hashing (massive speedup)

Attempt to disable vertex hasing to provide massive speedup for those games which use sparse indexes intersively.
For example , Gundam VS Gundam Next Plus 

This should benefit mobile massively.

Before
![screen00015](https://f.cloud.github.com/assets/3000282/1408407/a96d813c-3d81-11e3-97c3-40f104ae33d4.jpg)

After
![screen00016](https://f.cloud.github.com/assets/3000282/1408409/abeace92-3d81-11e3-999d-3f8c398b1e6f.jpg)