No there there isn't 
But forwarding them isn't dangerous unless you have some weird trojan running on ports 10052-10054. And BTW, anyone who accesses the internet has an IP address visible over the internet. For example, if a moderator were to click the "IP" button in your post, he would see your real IP external IP address, even if your using a router.
I see no danger in forwarding the ports. If you're really paranoid, you can only have them forwarded when JJ2 is running, and unforward them when you're done.
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With our extreme gelatinous apology,
We beg to inform your Imperial Majesty,
Unto whom be dominion and power and glory,
There still remains that strange precipitate
Which has the quality to resist
Our oldest and most trusted catalyst.
It is a substance we cannot cremate
By temperatures known to our Laboratory.
~ E.J. Pratt
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