Starship Corporation

Sensors
A good sensor array would be nice to have both for pirates to find ships and for merchants to avoid them.

Most shield systems would probably be easy to detect if active, but would I turn mask what’s inside the ship.

Long Range: a few light years but can only detect really large object or objects with a high energy emission (Fleet Battles, etc..)
Medium: Solar system range and some more information would see most large ships and structures
Close range: planetary rang and even more information
Archeological Scanner: used for finding traces of lost civilizations
Ship: close to the ship
Gravitational flux scanner: detect Cloaked ships when active but would be processor hungry.
Cargo scanner: Not any fun in boarding a cargo ship just to find out that it transport toxic waste =)
Weapons control array: finding weak spots and aiding accuracy

Inertial dampeners
without it the crew would mutiny when the commander gave the order to activate the FTL.

If the ship has the engine to reach light speed it still would take some time to safely accelerate.
Approximately 6 months with a constant acceleration of 2g, and another 6 months to decelerate.

that is of course if one does not have a Inertial dampener.
if a ship sustains damage to its ID it would inturn lose its ability to jump away, atleast with its crew alive.

Some Trivia:
To accelerate the Enterprise(Star Trek) to 50% of light speed would take about 2000 times the annual power production of earth (2011), The generators to Power the FTL drive would need to be impressive.

At 90% of light speed a ship would have about 220% of its starting mass.
and at 99% light speed, the ship's mass has increased seven-fold
(relativistic changes in mass)

I like the idea of using sensors, haven´t thought about that yet. I addition to the purposes you mentioned, it could be a great tool to have to get a rough layout of an enemy ship before boarding (like a radiography picture of the decks).
Sensors (mounted on the hull) could then of course be great initial targets.

An idea for the mechanism behind an 'internal mapping device' for use against enemy ships could even be a 'sonar limpet' projectile. Fired from an ordinary cannon, it adheres to the hull of the enemy ship, then sends sonic pulses through the hull, mapping the interior. The projectile would then transmit this data back to your ship.

Presumably, ships could remove these limpets, and any other weapons that involve adhering or attaching to the hull, but the longer the limpet stays in place (or the more limpets are attached at once), the greater detail is revealed over time.

A zero-risk, low-reward (and extremely junk science!) alternative could be a kind of laser microphone that targets a ship, then measures vibrations of the hull, and attempts to correlate them to interior sounds (footsteps, alarms, echo patterns) and create a rough interior map that way, however this system would be excruciatingly inefficient.