In fact the changes are very chipsets specific. sztupy made it for a Galaxy S, but the Galaxy S Plus use a different one, and the Galaxy Tab 7" too, I guess. So does it for the GT 8.9 and 10.1 (Tegra 2 inside. ^^).
So we need all the specifications and the pins out depending if used with a "hacked" OTB Cable or the OTG Dongle from GT 8.9 and 10.1. So not so easy... ^^
At least this have been integrated in the the CM9 ICS ROM and kernel version. I have seen this was working a hacked OTG cable, but don't know yet if it's working with the official Samsung Dongle.
If any one have this dongle can test it and report back ?
Can't do it myself as I lost mine for some months already and can't retrieve it...