The 20m restart when ball caught on full in in-goal by defending team was introduced for start of 1986 season.
The instance mentioned earlier of Parramatta/Cronin wasn't feigning to kick at goal (that was made illegal after Messenger in early 1900s).
After finding touch from a penalty, while it is usual to take a tap re-start as the "second kick", the rule actually specifies "free kick" as the re-start - Cronin was using that to kick the ball across field towards the goal line - if he had kicked a goal from that it wouldn't have counted.
The instance mentioned earlier of Parramatta/Cronin wasn't feigning to kick at goal (that was made illegal after Messenger in early 1900s).
After finding touch from a penalty, while it is usual to take a tap re-start as the "second kick", the rule actually specifies "free kick" as the re-start - Cronin was using that to kick the ball across field towards the goal line - if he had kicked a goal from that it wouldn't have counted.
Free Kick (Second Kick)
4. The ball may be kicked in any direction in any manner when bringing it into play after entering touch and the kicker himself may pick up the ball after he has kicked it.
FREE KICK is the kick awarded to a team which kicks into touch from a penalty kick. The kick is taken 10 metres in from touch opposite the point of entry into touch and the ball may be kicked in any manner in any direction. A goal cannot be scored from it, nor can ground be gained by only kicking into touch on the full.