[Yaffs] Maximum file size

I saw a post on the Linux-MTD mailing list (post from about a month ago)
that said the maximum file size for YAFFS2 (with a large page NAND) is 2GB.
The person who wrote this said it was due to YAFFS_MAX_CHUNK_ID *
chunksize. YAFFS_MAX_CHUNK_ID = 0xFFFFF. Can this be increased without
effecting functionality otherwise? What is the reason for it being this
size in particular. My device is potentially going to need a file size of ~
4GB. Any feedback would be appreciated.

Thanks.

Ross S.