[Evil Rich]

There are two buttons in the game setup that you can turn off the.

Allows Gifts/Tributes &
Allow Technology Gifts/Tributes/Trades

If these are both turned off then there is no direct trading of tech.

Given that as far as I know is no way to stop people building ships, trading them away and then the recepient analysing them, then I don't see any point forbidding such practices.

It might still allow trading of certain techs, but it is going to be much slower, cost more resources and is going to be limited enough that it will no longet dominate the game.

If there is a way to turn off the analyse option then that might be interesting but I don't know if that is possible.