Thanks for the question!
I am going to link some articles from Eric Cressey on long toss because he does a fantastic job with this.
http://www.ericcressey.com/mak...n-a-throwing-programhttp://www.ericcressey.com/the...4-long-toss-mistakeshttp://www.ericcressey.com/lon...our-throwing-programIn general I think long toss is fantastic. It would fall on the far end of the "speed" spectrum in terms of the strength continuum.
Absolute Strength = Weight Room - Basic Lifts
Strength Speed = Heavier Weights moved quickly, in terms of baseball athletes I put med ball throws and jumps here
Speed Strength = Plyometrics, weighted balls, long toss to some extent depending on position
Speed = playing the games, also long toss to some extent depending on position
Depending where you are in the season different ends of this spectrum are hit more. However elements of each category should be present.
Well Out of season there is going to be a lot of lifting, no throwing.
Mid off season - less heavy lifting volume more med ball work, some weighted ball work, begin throwing
Closer to in season - less heavy training volume, less med ball work, more throwing
So in season I think that a baseball player should manage his lifting in accordance with his game schedule. Baseball is played almost every day. So recovery from the games is first priority and time in the gym should be spent on more restorative qualities - Mobility, soft tissue work, tempo work.
That being said I would try and keep the intensity high on the big lifts (one top set at 80 - 95%) but the volume should be extremely low.
So if they get in once a week we are going to hit that big lift (i.e. trap bar DL) with some intensity but really limit the total work done (volume) so there won't be more than one main work set, and not a lot of assistance work.
Hope that helps.