No, filing after the deadline slightly decreases your audit risk as long as you are not paying late.
As MayaD points out, the penalty for failure to file is a percentage of the amount due, so if no amount is due, there is no penalty. That being said, the best practice is to file for an extension, even if you don't owe.
As far as filing now, and amending later, there is no real advantage to that. It is almost twice as much work and unless you are anxious to get your refund, it is best to just file when you have all of your information.
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