Usually they don't care who you're trying to work with, and if you request a certain ride/location they will definately try to put you there. It's better to have you where you want to be, even if it's a tad more paperwork, than lose an employee before they even start!
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PO!NT OF VIEW - A Different Look at Roller Coasters
http://www.crosswinds.net/~justmayntz/thrills/