Nice guide, but you're missing a couple "utitily tools" from Shadow priest:
Psychic Scream with http://www.wowhead.com/item=42410 would work as short-term CC, just like shockwave from Warriors. To root the mobs in place for a short time. Can also be considered as interrupt on certain mobs.
Psychic Horror (Better if equipped with http://www.wowhead.com/item=42405)- Rooting a mob, disarming the mobs (works on some bosses), and also a short-term CC, interrupt.