At Faria we use hackpad a lot.
It has bunch of shortcuts, like cmd+b for bold, cmd+i for italic), cmd+u forunderline, cmd+e for highlight. The full list is there:
but there are one shortcut not listed in the pad: option + ↑/↓, you can move whole line up and down.
It works like the ctrl + cmd + ↑/↓ in sublime text.