Add functionality to 3.0.3 TinyMCE editor

I did this in version 2.2.5 but can't find a thread in the forum for version 3.0.3. Is it the same method? I want to add functionality to TinyMCE editor (i.e. justify text, etc.)

See this post: TinyMCE - Hints & Modifications - CS-Cart Community Forums


Thanks JohnCarroll!