I reckon the best way to do it is like Rugby if a player is down ( not in the box tho ) then the physios can come on while play continues
I'm sick to death of seeing players go down 50 yard behind play and the Ref blowing as soon as they hold their heads and then giving an uncontested drop ball once the cheating gets side have all got back in position
As an aside id also make it an automatic bookable offence for any player running up and across a ball to stop a quick free kick
Pritchard did it on loads of occasions the other day and nothing done