This is one feature that I wish was included in RCT, so that you could make up your own extra levels without trainers and such. I don't use trainers, since my computer is finicky anyway, but maybe if there ever is another release of the game we'll see a scenario editor.
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Po!nt of View: A different look at Roller Coasters.
http://www.crosswinds.net/~justmayntz/thrills/