The default slur direction almost always happens to be the opposite of what I want on a given sequence of notes. It would be really helpful to be able to have slur direction (and tie direction) includable on the Toolbar.
Wouldn't mind this myself - I tried to see if there was a way to do it using a selector but can't figure a way to make it happen.
What would also be nice to have is a way to create a button or selector that could run a specified user tool. This would essentially fulfill this request, since it would not be too difficult to create a user tool that sets slur or tie direction on selected notes. This could then be accessed by a click, or a keystroke, since selectors can have keyboard shortcuts. This would also be very useful for custom objects' user tools, such as those for creating arpeggios and tremolos.