That's right, no chance of an Intel SATA chipset update on your or any Intel board. Really sux for X58 too, such a great platform in its day, and it still is. The first Intel SATA III chipsets were the 6 series, like P67 and Z68 (Sandy Bridge CPU boards) but only two Intel SATA III. Finally got six Intel SATA III ports on Z87 chips.
Yet they keep using the lousy Marvell and ASMedia SATA II 2/3, as I call it, at 5Gb/s. I've got four ASMedia SATA ports on my ASR Z87 board, and never use them.
Still, your board's ICH10R SATA chipset is probably the best PC SATA II chip ever made, stable as can be, has all the Intel RAID options. I had four SSDs in RAID 0 for a year on my X58 board, finally removed them just to do something different, the SSDs (Samsung 830's) did not fail or did I lose the RAID volume. I had to run diskpart clean commands on them and then SE to remove the RAID data, it didn't want to die!