The idea of commands working within the text doesn't really sound too useful to me. I'd still need to put quotes around the speech to separate it from actions as I now do, and I'd only be substituting something like, /me laughs, for, then she laughs, not a real time saver, besides having it come out as, Dannae laughs.
I do like the idea of having the ability to start with narrative.
Maybe it could be added as suggested by Bonifarzia like /nar when narrative is to be used at the beginning by spelling out the chars. name in brackets.
The ability to use this in the middle of speech is unnecessary because it would not negate having to enclose the speech within quotes to separate it and would read no differently. I suppose a /nar command could be made to color the narrative, but it would still require some way to tell when the narrative ends and speech begins again if it could be used in the middle of speech.
Off topic a little, even with my personal preference for shorter posts, I would still love the ability to negate the need to use quotes to separate speech from actions as I now do. I'm forever forgetting to put the quotes at the start or end or having to scroll back through the text to add when I've decided to insert an action within the text before posting. I don't believe there is a way to do that, unfortunately, since there would always need to be some kind of symbol or character to separate the two, so may as well remain quotes.
Examples of what I do now:
As one post I'd type using quotes:
/me steps closer to Caraick, "Hey, if it isn't my ol' menki friend" she then kicks Caraick in the shin, and winces, "Ow! Dammit... now you broke my toe!"
But still preferable to me than as four separate posts:
/me steps closer to Caraick
Hey, if it isn't my ol' menki friend
/me kicks Caraick in the shin, then winces
Ow! Dammit... now you broke my toe!
I'd be much happier with cut and paste ability so I can see all my text and edit or add quotes where necessary, but that's been discussed before as too difficult of a feature.