Thats true. But there is also one way to sneak without toggle sprint, just place a hard item on your Shift key in order to sneak for a long amount of time :PAnother problem that comes with the togglesprint mod is that it comes with togglesneak which isn't a great thing to have on your server, because people could hide for a whole game whilst sneaking whilst not even looking at their screen.
But they could still use the player tracker which not many people use for some reason. Still, Togglesprint shouldn't be allowed as it is an advantage to time itself which give other players a disadvantage.