Hard SF spacecraft designs: cargo ship, battleship, and fighter

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I thought about two manuevers, i wonder whether they make any sense?
A: connect two fighters with carbon nanotube cables, and rotate that squadron around its new centre of gravity.
So with tether propulsion, they can change position without using thrusters, that can't be hid.

B: Position two ships into vicinity, fire their thrusters at once, so it won't be obvious, whether ship A fired with 100%, ship A fired with 50% and ship B also fired with 50%. So it would be hard to calculate their acceleration based on the flames of thrusters.