In some languages the character’s dialog is with quotes “” but in other languages the norm is to use M-dash (long dash) to start a dialog.
I don’t see that anywhere in the editor or in the Keyboard shortcuts. I am writing a text editor in Microsoft .NET and in my editor toolbar I added both the M-dash and the N-dash so that they user can quickly open a dialog with that if required. I find it much quicker than a key combination I am not good at because usually those that you are more likely to remember conflict with existing ones.