To answer your other questions (I just realized I received a PM):
1. Can you fly as enemy ships?
Yes, but you have to make ships.tbl adjustments and a) change afterburner fuel b) add "player ship" flag
2. Is the cloaking feature available yet to use?
Not in the prologue. The cloaking per se is done via a fairly complicated FRED script for enemy craft (Strakha and the like). I guess it can be utilized for the player, just like the autopilot script. At any rate, you can't use it yet, as you need a complete set of animated texture maps for fighters and these will be released only when the final game comes out.
3. Also can you edit ships to equip them with cloak?
Again, it has nothing to do with ships data. The effect is scripted in FRED.
4. Can you edit ships weapons and stuff like that?
Yes. It's done via ships.tbl.