Maneuvrability should stay the same if thruster strength scaled with volume and therefore mass, so there's significant added inertia: *the speed from 1 kN thrust on 1 ton is mistakenly greater than the speed from 10 kN thrust on 10 tons*...

No, it should not stay the same (if we are talking about how real physics work). What you say works only for linear acceleration (and it, indeed, stays the same in Avorion after scaling, as it should be IRL).

Rotational acceleration is inversely proportional to

**moment of inertia**, which, in turn, is proportional to V*a^2 = a^3*a^5 = a^5 (that is, volume*linear scale^2, or, since volume = scale^3, moment of inertia is proportional to linear scale to the power of 5).

Rotational acceleration is directly proportional to thruster torque, which, in turn, is directly proportional both to thruster volume V and lever, which also scales lineary, so tourque is proportional to V*a = a^3*a^1 = a^4.

Since a^4 grows slower than a^5, rotational acceleraton lowers as you upscale the same ship. Everything according to how actual physics work.