I’m not sure a “Yesterday” split would be enough to track bullpen usage- e.g., if your RP didn’t pitch yesterday but did appear in games the previous three straight days then he probably is still worth sitting even though the “Yesterday” split would suggest he could be used.
I’d like to see a “Calendar” drop-down which shows how many IP’s (or, preferably, Pitches Thrown) over the past X days for each pitcher. This would allow for a more complete tracking of bullpen usage.
A bonus would be the ability to preview the upcoming games as well; so for example if there were 10 columns then the first 3 would be the upcoming games, the fourth would be today’s game (highlighted if possible), and the following 6 would be the previous days that show either a blank or each pitcher’s usage that day.
For position players it could simply mark each Game Played or Game Started with an “X” or some other mark, or it could list how many PA’s or H/AB they had for each game. Another bonus would be the ability to preview the opponent’s scheduled SP for each upcoming game on the calendar.