Well, long, long ago, a "hacker" was attempting to hook a ISA bus to the LPC points. Apparently, it's possible... I swear I saw some pics. Maybe I'm wrong. If it is possible, you think you could attempt to add a rudementary ISA (or, I daresay, a PCI) bus? Then projects like Dreamix could be more feasable....
Maybe some type of on-board RAM or whatnot could be added, for VM paging. I'm pretty sure it couldn't be used as 'system' RAM, as I'm assuming that those chips are initialized before the LPC bus is (to check, unsolder one of the RAM's legs... it will not boot, regardless of what mod is installed). Still, if the homebrew programs are coded to use it, it could help in developing VM paging much, much faster (as apposed to a software-only approach).