I can see the kernel has xattr support built in:
and I can't see any problem with enabling it on the B2's main partition but I was just wondering if anyone had any prior experience of it?server:/# zgrep XATTR /proc/config.gz
# CONFIG_EXT2_FS_XATTR is not set
CONFIG_EXT3_FS_XATTR=y
CONFIG_EXT4_FS_XATTR=y
CONFIG_CIFS_XATTR=y