Would it be a good feature to allow you to set your lineup for 3 games in advance? That way if you miss setting your lineup for a game atleast your batting order will be set.  The problem would be your pitching staff especially relief pitchers because they tire quickly.  Another problem may be other teams changing starting pitchers? I'm not sure what do you guys think?

I've never given this much thought, as I tend to manage my teams daily unless I'm on vacation or otherwise unable to access my computer. That being said, you can essentially set your line up in advance by setting your auto fatigue percentages, allow rest boxes, and player hierarchy in advance with thorough thought. In short, I don't think it's a good or necessary feature to pre set your line ups for three games in advance.