Josh,
Check out Brendan's answer here http://devnet.kentico.com/questions/source-button-missing-from-wysiwyg-toolbar-after-upgrade-to-8-1
With Version 8 the WSIWYG defaults to a watered down version of functions. I think this was because most of us modified the default to a watered down version because we are trying to keep content editors in a more ocntrolled content environment.
Hope that helps.
Tx,
Virgil