I think that the options was designed to aid overclocking of low end cpu's (think e4300 etc). However being Asus' top of the line P45 board, the M2F was probably not expected to be paired up with low end chips, hence the option is not present (that's my take on the situation anyway).

Interesting what you said about Mem OC Charger, I always assumed it was asus-ese for ram drive strength. With my M2F, I cannot overclock the ram over 605 MHz with it set to disabled, but with it enabled, I can bench at around 650 MHz. Also with it enabled my D9's are stable at 600 MHz 5-5-5-15 @ 1.98v, whereas they need around 2.05v with it disabled. So you are saying that when it's enabled, ram clock skews when altered have no effect in reality as it presets & locks them? Any more info you can give regarding that option would be appreciated.