The Universal Remote will only offer what allin stated above.
The APP does give more options - you can adjust the individual volume levels, you'll be able to change the whistle/horn and bell pitch levels, there's a smoke on/off option, momentum control.
For most functionality though, you will need some sort of TMCC controller, whether it's the Legacy 990, the Cab-1L, or the Cab-1. Using the 990, the LC2.0 engines have to be programmed as TMCC engines; they will not run if they are programmed as Legacy. The Aux1 button will allow to cycle through the whistle/horn and bell pitch levels.