Nope.
Nope.
Nope.
According to Damien it HAS to be a Muay Thai Roundhouse kick for you to use the word roundhouse.
Otherwise the Nomenclature Nazis will hunt you down and make you do Taekwondo.
And then you're self defense skills will be nil.
As far as striking with the shin, I wouldn't. But that's just me. Lot's of people do it.
Word.
Spanky