Telepathy, given the OP’s condition that it can be turned off. [ETA - and, of course, if it couldn’t, I’d rather not have either. See below.]
Aside from the whole ‘we already have rules that apply perfectly well’ part, there’s the fact that precognition is pretty much worthless.
Either you can’t change what you see, or you can’t be sure the conditions will really lead to what you saw happening.
To put it a different way - if I can change the outcome of events that I’ve foreseen, then the idea that I’m the only one with the ability to do so is incoherent, so there’s no guarantee - or even particularly good odds - that what I see will happen how I see it. Someone else may change their mind at the last minute…a subatomic particle may decay a millisecond later…a dog might decide to pee on the neighbour’s begonias, not their gardenias…any of which could skew events in ways that my precognitive dream didn’t predict.
Contrarily - if none of those things are a function of randomness or free will, therefor, I can guarantee that what I see will come to pass…I can’t do anything with that information. I can’t stop whatever it is from happening, I can’t profit from it. So, why would I want to know about it?
Of course, in that case, what I want and don’t want is a nonsensical concept. I want what I’m predetermined to want, and I get what I’m predetermined to get.
Then there’s the third possibility - free will and randomness exist UNTIL I dream about these future events, which then locks circumstances in until the predicted events pass and the world returns to its previous non-predetermined state.
That creates the moral problem of taking away other entities’ free will, and the practical issue of fucking up my own. Not something I want on my hands.
The only way it’s any good is if it’s REALLY short term - a world with free will and randomness, but the predictions come close enough, temporally speaking, to when the actual events happen, that, barring my, or somebody directly involved, deliberately changing the circumstances, there’s not enough time for changed circumstances to percolate into significantly different outcome.
But that has it’s own problems, when it comes to big events - I could probably make some money on horse races, or casino games (until they banned me for winning too much, even if they couldn’t know how I was cheating), but winning the lottery, or playing the stock market, or, less selfishly, mitigating natural disasters, or stopping crimes…that’d be out of my power.