I'd just like to point out that while lx_fs is handy, it doesn't always work as well as the other file system servers, so if you start running into problems, try the ram_fs or the vfs. If you are dynamically generating and writing the roms to a file system I would use one of those two because, for example, lx_fs does not support update notifications.
I myself use the vfs and fs_rom servers as a persistent shared state between components, but I'm not sure if this is the same as what you are doing.
Emery