I actually thought about doing this myself, but less for improving performance and more to prevent my books from being wiped out after every factory reset (I have a GloHD and thus, no external sd reader; reloading from scratch takes like 20 hours to sync up my entire sideloaded library), as I assume that the factory reset script is hard-coded to wipe out the third partition only.
I haven't had time to play around it myself, though, but I would assume that you'd need to change the mounting scripts to see the fourth partition. But I don't know if the OS is smart enough to automatically probe that partition for new books. If not, for devices without external SD, one thing I would try is figuring out what the mount point is for external SD cards and mount that fourth partition to that, assuming the OS is hard-coded to search that mount point. That wouldn't work for devices that have both internal and external SD readers, though.
One day I will try this for myself...
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