answered
Q: If you could make one rule change in any format of the game what would it be?
A: On LBWs:
The square leg umpire be consulted about LBW decisions regarding height.
Reasoning:
Square leg umpire can see better where the batter stands and so currently signals on height for wides over the head and full tosses over the waist but not LBWs.
This consultation with a second pair of eyes would give the main umpire better advice on one aspect of the possible LBW decision