I use EZPass which works the same as SunPass, and the language clearly states I can use it in a rental car without doing anything special (e.g. registering the rental on the car to my account). Not sure about rental company's limitations on using your own Pass. When I've flown into MCO, I usually get the rental car with their Pass, compared to what I'm spending on a trip, the Pass is a pretty trivial expense and a great convenience.
Direct quote from EZ-Pass
"Should I add my rental car information to my E-ZPass account?
Do not add rental car information to your E-ZPass account. However, you can use your E-ZPass Tag in any vehicle of the same class. Please ensure that your E-ZPass Tag is properly mounted as per installation instructions in all vehicles in which the Tag is used. A Tag that is not mounted properly may prevent the Tag from being read in the lane. If your Tag does not read, you will be subject to the terms of your car rental agreement that apply to E-ZPass usage, toll transactions and/or violation transactions."
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