I'm pretty sure we're not supposed to tell people why a suggestion is bad (in our view), but only offer constructive criticism in these posts. That said, there are a lot of good reasons to fudge dice rolls (and bad ones, also, I admit). Just as an example: if you're about to kill the last player standing, maybe missing what should be a hit, or making a critical a normal blow, will give the party a chance to avoid a total party kill, and pull off an unlikely but heroic save. And you really don't want them to know that, or at least I don't. I want them to own the save, I merely gave them the opportunity. And yeah, narratively it's not the best choice, but the point of a game is to have fun, not write the great american novel. I've fudged rolls to benefit the players more than once over the years. I'm also very careful not to do it arbitrarily, but only with what I see as need. As Rick A. noted, It's also useful if you don't want the players to guess from the rolls that the enemy has a +3 sword or some other magic item. I often want to hide advantages like that from the players, and let them discover them in-game, not by analyzing roll values. Being able to block "hover to see" the modifiers to a DM's rolls would be useful in a lot of contexts. I'm not sure how you'd implement a "I don't like that roll, let's do it again" in chat though. But I don't need to figure that out, that's Roll20's job. My own approach is what Ian said: I simply hide ALL of my rolls from the players, except in rare cases where I want them to see the roll. Either I roll with physical dice out-of-camera, or I modify all NPCs in my games to "only whisper rolls" to me. It helps that I've played with the same people for decades, and they know I'm fair. But ultimately, it's the same as a "real tabletop" with the DM rolling dice behind their shield, which is how D&D, and other early RPGs, was played originally. And is roll fudging really different from roll hiding? Either way, you have to trust the DM's motivations. And if you can't, maybe it's time to find another DM. I'm giving this suggestion a +1. Although I do think it would be useful for "can fudge rolls" to somehow be a game setting that is displayed to players as an attribute of a game, so there can be game sessions that explicitly do not allow fudging, which could be useful for pick-up games with strangers or some paid games.