To my knowledge the motion effects are currently in the balancing stage.
The developers, to my knowledge, are working on balancing the motion effects to the targets engine block count.
But I don't like push effects to not be able to push your own things any-more if you have no thrusters on it.
I suggest stop to be "make velocity equal to yours" and trap target at a constant distance.
If you want to get close, use pull too.
Details:
Stop increases a force-negator-counter (FNC).
Each time a force would be applied, the FNC is reduced instead.
The FNC gradually reduces by being multiplied with 1^(1/ 3sec / x"steps per second"). In 3 seconds it should be 0.
The passive push effect may have a longer cool-down and be able to evade easily. Pull (lower cool-down) may evade not as easy, but greatly increases your chance to.
After all push was meant to help big ships escaping gravity, not to constantly push like a thruster.
What do you think?