Next dialogue to spacebar, and exiting dialogue ?

[Mhaeric]

Is there any option to rebind going to the next line of dialogue from the left mouse button to spacebar?

It's already bound to Numpad-0 and you can just change it to whatever you want. There's a keybind menu in the main system menu. It will override jump, however, if you bind it to the spacebar since you can't have more than one function bound to the same key.