MAR Chart - Carer Initials

With regard to the MAR charts, we have carers who have the same first & last initials so it is difficult to see who has actually given the medication without going into each and every one. Is it possible for the initials of the carer who gives the medication to be shown as up to 3 characters instead of the current 2 characters – this will enable us to use middle names to differentiate between carers.