As a for instance, I recently did a ladies development league game, and I gave a bit more instruction about what I wanted from the players, so more preventative refereeing and a bit more explanation of what they were doing wrong. Similar to how you would ref M&J.
However one of the players asked me if I could let a bit more go, as it was a development game (I am guessing knock-ons, slightly forward passes). My answer was no, because its a league game, so you still need to adhere to the laws, but I will try and assist you in understanding those laws.
Was this the correct approach? How do other people manage it?