You probably have to define "tweak".    My BL players get 10 AB or 3 appearances.   The rest of ST "tweaking" is me moving minor leaguers in/out in an effort to get them at least 10 AB.

I get my 25-man roster about 20 ABs and 5-10 IP and then play all minor leaguers (prospects or not) the rest of the way.

Not sure that's any of the above.

I maintain all my usual settings.  My starters play the first 4 games and then are rested for the duration of ST; 2 or 3 more "platoons" of position players come in behind them and play 4-7 games each.  I maintain a 6-9 man rotation, make all other pitchers SuA, and rest any bullpen pitcher who hits 5 IP.

As long as pitchers and position players don't lose DUR, ST, or HE over the offseason and have to "rebuild it" during ST, I see no reason to do the extra work to mimic real ST.

Tweak would mean, putting any effort in.

Then I probably need to change my answer.  

recently, and I may have hallucinated this, but my feeling from reading in between the lines of HBD site staff is that appearances count more than anything.  I make sure my prospects appear in as many games as I can get them and that Big Leaguers get 6 games

I used to give my starters some play time, but then I lost my ace for 80 days in his first ST appearance after he threw 5 pitches.  Now I send all my starters away on vacation until the regular season begins.  

Posted by MikeT23 on 11/7/2013 12:56:00 PM (view original):
You probably have to define "tweak".    My BL players get 10 AB or 3 appearances.   The rest of ST "tweaking" is me moving minor leaguers in/out in an effort to get them at least 10 AB.

Almost exactly what I do with position players.  My BL pitchers get one start or a couple/three relief appearances.  Once the get past 5 innings, they're done.  The remaining lion share of minor at bats/innings goes to my future ML prospects.

I can't think of a good reason to play anyone between the ages of 27-30 in ST, and pitchers up to age 33 or so.  But I do it anyway in case I'm missing something.  

Posted by timb116 on 11/7/2013 5:10:00 PM (view original):
recently, and I may have hallucinated this, but my feeling from reading in between the lines of HBD site staff is that appearances count more than anything.  I make sure my prospects appear in as many games as I can get them and that Big Leaguers get 6 games

I had staff respond in a ticket that it was games played that was the factor, not necessarily innings pitched or at bats. But it wouldn't surprise me if someone else got a different answer.

Play your ML starters enough to get them in opening day shape, and get your best young prospects as much PT as possible.