I don't really understand what you're getting at. I work for Google so am an "insider" in that sense. The database engines built on top of LevelDB-equivalent code are not secret. They're called BigTable and MegaStore, you can read papers on how they work. They aren't appropriate for Bitcoin and never will be.

Re: storing scripts in the index. Yes, eliminating the blkN.dat files and putting all data into the key/value store may be a way to further reduce seeks in future. It's a more complex change though. Anyone is welcome to contribute patches that speed things up. The key bottleneck right now is block propagation time. Small improvements in that metric can result in big changes in how quickly a newly solved block gets everywhere.