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The topic's come up once or twice before that I recall. And in short, the answer was "Yes, that can be done, but it's not worth the trouble." An administrator has to go in and look at code or some such that really doesn't make sense to an e-simpleton like me, but it would be too much work.
Like Caluin says, the system will keep you from overrepping someone in too short a time span.
Unfortunatly, there is no way for a standard user to track who they have given rep to in the past.
The rep system will automatically stop you from over-repping somone so there is no reason to worry too much about it.