For any Mac users out there who've successfully run RCT or RCT2 only to find that the game is unplayable because you can't use a right click to delete placed scenery, this is how to fix the problem. I changed the settings for my Trackpad (I'm using a MacBook Pro) which you can find in System Settings. You can go to the Point & Click tab and change your secondary click gesture to be the a press on the bottom-right corner. Sure enough it works and the game is playable again.