You nailed it regarding my misunderstanding with the All-Star Game. Now I get how that works, and simply moving it to the third day of the break is a perfect solution. That will allow us to sim up to Sunday as normal since the game won't auto-select All-Stars until Monday. Absolutely perfect. I'll make that adjustment myself then. And yes, this would also be an ideal solution for the LRS, extending the break to 4 days and placing the ASG on a Wednesday.
Okay, so that just leaves how to handle the schedule shifts. First, just so I'm clear as I prepare to edit the PEBA's schedule, is it enough for me to simply change the "start_day" line from "27" to "31" to achieve the 4-day push-back? That wouldn't cause any problems with the first scheduled series of the season, nor would it push the All-Star Game date back, right? I won't touch the "GAME day" lines as you advise.
As for the LRS, let's go with your suggestion to remove the 4th game from 3 series and create an additional 3-game series. It sounds like that would be easier for you, and I think it's a fine solution. I'm sure the league's owners won't mind having a few extra off-days to rest their starters.