Zubinsum is right. When I think about a player scoring from first on a single, I think first and foremost of Willie Wilson tearing around the bases (maybe running from the law in retrospect). This is a guy who hit five inside-the-park home runs in 1979, if memory serves me right.
Let me sort of back into my logic from a SIM perspective. Let's say for the sake of argument that a Speed Rating of 50 is the 50th percentile in SIM, a Speed Rating of 80 is 80th percentile and so forth. That's probably oversimplifying, but humor me. So guys like Harry Stovey `86 and Willie Wilson `80 are faster than all but one percent of all other players in the SIM, give or take.
How would this be expressed? Stolen bases? Not really. SB seem to be more a factor of RL SB/SBA and catcher's arm. Partially hits, I guess. And partially proficiency on the basepaths. Going from first to third on a single, scoring from second on a single and scoring from first on a double? Yes, but in my anecdotal experience the average SIM baserunner goes from first to third more often than he goes from first to second anyway, scores from second on a single more often than he stops at third, scores from first on a double more often than he stops at third, etc. Dahsdebater, are you saying that a Speed Rating greater than 99% of the ballplayers in SIM only increases the frequency with which he attempts and succeeds at something that most SIM baserunners attempt and succeed at anyway? Maybe, but I'm not convinced.
Now factor in the Baserunning Aggressiveness managerial control. Combine a baserunner with a Speed Rating of 99 or 100, who is faster than 99% of his counterparts, with a Baserunning Aggressiveness setting of, say, 5. Are you saying that those two factors combined would still only enable him to attempt a little more often and succeed a little more often at something the average SIM baserunner attempts and succeeds at on an average Baserunning setting? Seems counterintuitive if the Speed Rating and Baserunning Aggressiveness setting mean anything (which they may not) .
I think a guy with a Speed Rating of 100 and a Baserunning Aggressiveness setting of 5 would try to score from first on a single quite a bit, and might succeed quite a bit as well, depending on the other factors that zubinsum mentioned like number of outs, score, who's on deck, etc.
I'll find out soon. That's my latest fool's mission -- building a team of pure burners from top to bottom of my lineup -- Harry Stovey, Willie Wilson, Frankie Frisch, Buck Ewing, Chone Figgins, etc,, cranking up Baserunning Aggressiveness to 4 or 5 and cutting them loose. I'll let you know how often they score from first on singles, hit inside the park homers, etc.. They'll probably get thrown out a lot. Live and learn.