Lets face it, RCS consoles are broken. Either you need them, and they do crap, or you don't need them and they make you into a doughnutsinspace stunt monster.
Currently, the equation for them looks like this:
Quote:
Base Turning + (((Base Turning  3) * (1+Listed Effect))  (Base Turning 3))

So lets do some math! (All numbers are before skills are applied)
Assume a MK11 Blue RCS Console (+35% Turn Speed)
B'Rel: Base 23
 23 + ( (20 * 1.35)  20) = 30 (+7.0 deg/sec)
JHAS: Base 20
 20 + ( (17 * 1.35)  17) = 25.95 (+5.95 deg/sec)
Defiant: Base 17
 17 + ( (14 * 1.35)  14) = 21.9 (+4.9 deg/sec)
Vesta: Base 12
 12 + ( (9 * 1.35)  9) = 15.15 (+3.15 deg/sec)
K't'inga: Base 10
 10 + ( (7 * 1.35)  9) = 12.45 (+2.45 deg/sec)
Assault Crusier: Base 7
 7 + ( (4 * 1.35)  4) = 8.4 (+1.4 deg/sec)
GalX: Base 6
 6 + ( (3 * 1.35)  3) = 7.05 (+1.05 deg/sec)
Vo'Qov Carrier: Base 5
 5 + ( (2 * 1.35)  2) = 5.7 (+0.7 deg/sec)
These numbers are quite terrible. Any way you look at it really.

So: Lets change the equation..
Quote:
Base Turning + ( ( (Highest Ship Turning Speed +2 [25]  Base Turning) * (1 + Listed Effect) ) / 10)

Again, with the numbers, and the math..
B'Rel: Base 23
 23 + ( (2 * 1.35) / 10) = 23.27 (+0.27 deg/sec)
JHAS: Base 20
 20 + ( (5 * 1.35) / 10) = 20.68 (+0.68 deg/sec)
Defiant: Base 17
 17 + ( (8 * 1.35) / 10) = 18.08 (+1.08 deg/sec)
Vesta: Base 12
 12 + ( (13 * 1.35) / 10) = 13.76 (+1.76 deg/sec)
K't'inga: Base 10
 10 + ( (15 * 1.35) / 10) = 12.03 (+2.03 deg/sec)
Assault Crusier: Base 7
 7 + ( (18 * 1.35) / 10) = 9.43 (+2.43 deg/sec)
GalX: Base 6
 6 + ( (19 * 1.35) / 10) = 8.57 (+2.57 deg/sec)
Vo'Qov Carrier: Base 5
 5 + ( (20 * 1.35) / 10) = 7.7 (+2.7 deg/sec)

This isn't excessive. This isn't obscene, I don't see this as gamebreaking.. Real RCS thrusters are used to quickly and precisely maneuver large ships and space stations by applying impulse in specific directions to supplement the Stability Augmentation Systems.
Sure, assuming you have four RCS, one can get a Vo'Qov upto 15.08 base turn rate, up from 5, but that's sacrificing four engineering consoles.
Rather then rebalancing all the ships in the game, it's my opinion that this will not only help equalize the turning disparity between ships, but also give use to a flawed, outdated, and generally useless console.