One thing that always puzzled me about bullet time in Project Nevada, to be completely honest, is that we already have Turbo in the game..
Two drugs adding bullet time seems overkill to me.
Well, our bullet time is meant as an alternative to VATS for people who like things a little more dynamic. While turbo adds bullet time as well, its far too rare to fit the purpose of a general VATS alternative. Also, turbo only slows down surroundings while PN bullet time slows down the player as well (unless you have implants to upgrade it).
But I agree that overall turbo was made less useful now that bullet time is available anyway (even though its not as effective). Maybe we can think of a better way to give it a more distinct purpose.
Jet requirement in FWE simply required you to have Jet in your inventory when activating BT, effect of Jet remained the same. Making it a Turbo requirement instead would make more sense, but that is too rare in the game.
I liked the bullet time Jet requirement in FWE because back then bullet time was much better, and due to the fact that the time change happened instantly it was easy to abuse especially with sniper rifles. That's why we nerfed it by adding a short transition time etc. So I think adding a Jet requirement on top of that would be overkill.
What we could do, however, is enabling the implant sprint bonus (time slowdown during sprint) when taking Turbo, and the bullet time implant bonus (faster attacking & reloading) when taking Jet for a certain duration. We already considered that before but it was simply forgotten
I think it would be a nice way to give those 2 drugs a more distinct purpose.