Tor ExitPolicy for things that can't be illegal

Hello,

I was wondering if it would make sense to run a Tor exit node that allows outgoing connections only to very few ports that are almost impossible to get you in trouble.

For example: If I ran an exit node with ExitPolicy accept :53 and ExitPolicy reject *:everything

1. 
   

   would a user that happens to use my exit node be able to access only DNS servers and opening websites causes a timeout or

   
   


2. 
   

   would DNS requests go through my server and HTTP requests through a different exit node at the same time or

   
   


3. 
   

   would my server simply never be chosen as exit node, because no one only uses DNS?

   
   

If the answer is 2. then I would consider allowing any harmless port <1000, say 53 for DNS or 43 for whois.

https://trac.torproject.org/projects/tor/wiki/doc/ReducedExitPolicy

Thanks. :)

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