Thanks for the question. The version of the material optimiser in the latest version of Forest Pack should be saving its settings into an .ini file so the it remembers your previous settings. The file will be saved here: C:\Users\[username]\AppData\Local\Autodesk\3dsMax\2022 - 64bit\ENU\scripts\forestpack
In earlier versions I'm afraid settings were not remembered.
I hope that helps,