We've seen new quest techkits coming into the game more and more than before. But we can only use them - once. Now if you accidentally apply it on a wrong weapon you are screwed, if you apply it on a weapon and 1 week later you get another better weapon, you are screwed.
Why not make them - reusable, but limited?
This is an idea a player on Blight came up with (Grodec). It actually made a lot of sense and wouldnt be overpowered at all.
The idea;
You apply the techkit on item A. After a while you obtain item B and would like to apply the techkit on that item too, but the techkit consumed and is currently on item A.
Now, you deconstruct item A. Getting the techkit - back - as you deconstructed it. Now as you've the techkit back, but not item A anymore, you can apply it to item B.
This way you can only have - one - item with the techkit - but use it on another item as you scale up.
*edit* I do am - only - talking about the quest rewarded techkits. Not the player crafted ones like Deadly, Razor Teeth and so on.