im wanna force my self to not use techs for more realastic game play. is there anyway for doing that?
You could: patch the quests out of the npc, or patch the quests to make their cost prohibitively high, or make a Lua script to unequip any quest you're equipping + makes you forget them, probably a lot of other ways
You could look at how the tech tutorial mission do it. They force a tech to be equipped, and disable the other techs you may have. you could make dummy techs, or patch all the techs, so that they have no effect tied to them. I would probably opt for the latter patching option since it would be the same patch for all the techs, you would just need to copy and rename the file to cover all the techs. A little on the tedious side, but doable.