Has anyone thought of restricting pawn drops to files where a player does not already have a pawn? This might make them less deadly and less likely to be "abused". I've noticed that sometimes players can barricade their king by dropping additional pawns on the 3rd rank making an attack against the king too difficult and makes the game slow. I think pawn drops were designed to go on the 7th rank or somewhere else to attack 2 pieces, but barricading the king makes the game not fun and makes me want to play Shogi where there restriction exists.