Bullet time is already in the game though

It's in a chem called Turbo.
Which reminds me... since I prefer DKBullettime to Turbo, what I'd love to see at some point (after NVSE is out) is a version of DK_Bullettime that changes Turbo such that when you use it, it puts you into the same Bullettime without any AP loss - until it wears off, at which point you stay in BT, but at an AP cost (and if you use another shot of Turbo while still in BT, it simply suspects expenditure of AP again for a short while) --- making Turbo just a way of "extending" bursts of BT.
As it is, Turbo is nifty and all - but for those of us who prefer BT as a replacement for VATS (rather than an additional option), I think something like the above approach would keep Turbo interesting/useful.