You would need RELENG_7 (current) to get "age" it is probably easier(and safer) to just get the patch and use it.
http://people.freebsd.org/~yongari/age/ <---read the README and follow it. (you want "age.7.0R.diff" and the other .c and .h files)
Nirbo-- yes the "legacy" BIOS change is my way of switching between the no KB at boot choice but at login or keyboard at boot choice and manually plugin the USB devices after boot to have use at login.