Enlarging the bases from 15 X 15 to 18 X 18 - Probably OK, but I need to know more about the placement of the bases. The baseball diamond is a 90' x 90' square. Home plate is entirely inside this square with the point of the plate nearest the catcher being the corner of the square. First and third bases are similarly situated, with the base fitting into the corner of the square, the entire base being inside the square. The center of second base is located at the other corner of the square, resulting in one-quarter of second base being inside the square and three-quarters of the base being outside the square. If this placement is used with the larger bases that means that first base and third base will be three inches closer to home plate. That has significant implications, especially at first base. Requiring infielders to be stationed touching the infield when the ball is pitched - no. Requiring pitchers to step off the rubber when making a pick-off throw - lefthanded pitchers will have probably their most important tool of holding runners taken away from them. Is that good or bad? I don't know. Limiting pickoff attempts to 2 per plate appearance - no. Employing 15-second pitch timer - yes, if you must, but only with the bases empty and only if there is a similar timer for batters to get in the batter's box. Using an automated balls and strikes system - yes, yes, yes.