Nope, pretty much the only characters listed are those with FP availability. If the characters is 100% stand by, like say Phineas and Ferb at HS or Snow White in Germany, they are not on the list
I did have to work with it a bit to get it to take all my FP+ times but I did. Usually just manually reordering the selections was enough to get it to take them. But it did take work. It is more trouble than it's worth
But, for us to plan our morning attractions and our afternoon attractions I found it helpful. I was able to use it to group things in ways that makes our breaks more effective. If we weren't trying to work in lengthy breaks I doubt I would have bothered using it