The estimated burn time in ksp1 was very useful but the ideal time to start the burn is often not 50% of this time. It would be nice to be able to set the start of burn time and show a burn line rather than a point. The more the rocket will change in mass and speed over the burn, the earlier the burn should happen. I wont get into the math on a bug forum but the current warp to node landing right on the node is definitely not useful.