Best to always use genuine plugs. On the fords genuine or ngk works but on the PSA cars ngk is bad for the engine and it's usually bosch or genuine that are recommended lol but bosch don't work so well on the Zetec engines.
As far as I know mileage correction down is something IDS can't do, nor can it activate auto locking... It used to be able to do the latter but ford removed it when people started asking their dealer to active it.... Something to do with it not unlocking the doors or not reliably unlocking doors... One of the 2 in the event of an accident. So ford left it switched off to cover themselves.