Ships that are in orbit don't get moved properly as noted. Simply  
knock ships out of orbit before moving them.

There's no indication as to who has the current pick. This is  
especially bad for the first pick. How about flashing shields a  
couple times a second on whoever has the current pick, and keeping  
shields down for the other captain?

It might be nice to have a timeout. Perhaps this option could be  
voted on by the captains. I'd say something like 1 minute is  
reasonable. Pog suggests flashing shields faster the closer you're  
getting to timing out. (Plus the obvious messages.)