I feel like the slur and tie tools leave something to be desired. They're functional but I feel like just have the word "SLUR" and "TIE" is a little odd and took me a bit of getting used to in terms of where I actually place the tool. I think it would make more sense to have the graphic reflect the result, so have it look like a slur. With the tie, maybe just a hot key like SHIFT T that makes it connect to the next note. Just some thoughts.