There's no way to batch change tournaments at all. But, an alternative to changing your Points [for Playing] formula is to use a Stats formula. Points formulas are saved with each tournament and can be different per tournament, while Stats formulas are the same across all tournaments for which you are computing statistics. It was designed this way.
But, if you really need to change the Points formula used in all 150 tournaments, I might be able to cook something up to do it. No promises, but if you want to send them to me I'll see how hard it will be. Same with exporting them to CSV.