There is an easy way to freeze your skillpoints. First download Artmoney load the process, get a high number of points from a few games I did 471. Search for 471 or whatever amount you decide and freeze all the values. You will have infinite points. Be sure to unfreeze them and save the changes before you start the next game.
CoSMOS also works, so it's not just Artmoney that you can use. I can't confirm this for other positions, but I know, for a pitcher, and I've tried this on multiple separate runnings of the executable and different characters, that the following addresses work in CoSMOS:
Pitching Skill Points: 019165A8
Batting Skill Points: 0191659C
Fielding Skill Points: 019165A0
Running Skill Points: 19165A4
If somebody could confirm whether these addresses work on their machine and/or on other positions, that'd be great.