Its really not that big of a deal, keep that folder up with the new g1.dat file in it. In that same folder, have another folder called backup with a copy of the original. Then play the game. Once done with the game, folder is still up, delete the g1.dat and open the back up folder, copy paste.
I mean, hell even if it was for multiple parks, it would take less than 30 seconds to do and its not like every person is going to mod their g1.dat file.

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