Fly All Ships
To do this trick, you have to go into Windows Explorer or whatever it is you 
use to look at all your computer files. Go to your Alliance folder and look for 
a docment called 'shiplist'. when you open it, it shows you ship names, 
classes, etc. Near the end of the line, you'll see either the word flyable, or 
non-flyable. To add a ship to the flyable list, just type in flyable in the 
place of non-flyable. 

NOTE: With the larger ships like Star Destroyers and Cruisers, handling is 
EXTREMELY slow and the turrets don't work. Also, with any of the added ships, 
engine sounds don't work and sometimes cockpits don't show up.