Also, in regards to "This Component Complete". I had a dialogue in a mission on Tribble that was previously set to Objective Complete, which was removed for dialogues. The editor generated an error message saying I needed to pick a valid trigger.
So, I think that this probably would be the case with "This Component Complete" as well. At worst it will probably give you an error message so you know what to fix.
Edit: It looks to me like This Component Complete still exists as an option, too. So, as far as I can tell it has not been removed (unless it's not there when you start a new project, as I was using an existing one).
Really? I couldn't find it anywhere when I started a new project.