Since our player characters have "Title" selection drop downs, adding the above honorifics so that they may be used wherever the titles may actually get used in game wouldn't suck, and would be a nice nod to TOS tradition and lore (Commodores Decker and Mendez, Fleet Captains Pike and Garth ["...LORD Garth!" someone interjects from off screen...])
What's the harm? :-)
Personally, I think I'm going to color my Odyssey uniform silver captains' pips gold to signify the posting.