There's a guide on Gamefaqs that goes into a lot of detail on these topics.
http://db.gamefaqs.com/computer/doswin/file/wing_commander_iii_iv.txt
Here's an interesting one on the stealth\cloak fighters. And my two cents. I feel that stealth fighters are invisable to radar, like today's F-117. Cloak, on the other hand, makes fighters totally invisable. So it may well be possible for have 'stealth' fighters.
8.5.1. If the Kilrathi have cloaked cruise missiles, why don't they just
make cloaked "kamikaze" fighters with torpedoes strapped to their
hull?
-------------------------------------------------------------------------
First off, it needs to be understood that torpedoes aren't just big
explosives; during an active lock, the torpedo adjusts to the target's
phase shields so that it can cause much more damage than a conventional
missile hitting the shields (this was covered in the WC2 manual). If you
want a torpedo to do its job, it _needs_ to be locked on the target,
whether you've launched it or it's strapped to the bottom of your hull.
Simply attaching some torps to your fighter craft and running into a
capship won't accomplish much of anything.
As explained by Captain Eisen, the the Confederation uses the designation
"Skipper" to refer to cloaked missiles that must "skip" in and out of cloak
to re-establish target lock. As has been established in other WC games,
Kilrathi cloaking technology does not allow a missile to lock from inside a
cloaking field. Thus, even if directed by a pilot directly to its target,
the torpedo itself would not be able to penetrate a capship's phase shields
without decloaking to acquire a lock.
Another possibility is that the interference works the other way around --
that the locking signal a Skipper maintains somehow interferes with
Kilrathi cloaking technology. If this is this case, a torpedo locking
signal used in the vicinity of a larger cloaking field might make the cloak
become unstable, rather than the missile lock.
Remember that in WC2, the Strakha stealth fighters always had to de-cloak
before launching missiles at you. Assuming Kilrathi stealth technology
hasn't had any major breakthroughs in the past two years (and there are no
indications that it has), this supports either of the two theories
presented above.