I mean, you can do whatever you want while emoting, it's all RP. You don't have to strictly adhere to something like *nods at Gareth* or *helps Oriana* and do something more freestyle like:
*smiles and takes the loaf of bread, placing it in his bag* Thanks, Hayden. That'll keep me fed for today. *gives him a questioning look* You're going to be open tomorrow, right?
Besides emoting, there isn't much else beside maybe "quotation" or 'apostrophe' around words to give more significance and tone to them. Also, timely... *pauses* and... ellipses, can add subtlety. The LLM seems good at picking up on those, especially if it's suggestive. Random example:
*blinks in surprise and blushes lightly* C-Celandine! Really? I... don't think it'd be a good idea right now. *glances over at Oriana who is glaring at both of you as she's cleaning the tiled stone floor nearby* Your sister is... 'watching' us. *pauses at seeing Celandine's mischievous smile and raises eyebrow* Unless... you want her to watch?
You can even use second person while emoting to suggest the NPC to do, feel, think, or want things. Though I try to keep that to only the lewd scenes as that's the only time it seems appropriate since they sometimes ask what you want them to do. Another random example:
Well, have a goodnight, Mirel. See you later! *he turns and walks out the bar door with a wave, leaving you feeling like you missed an opportunity as you think about the lonely night ahead. With a sigh you promise yourself that next time you're in Silverpine, you will definitely get him to sleep with you.*
You can also try using other special characters to have some other meaning, like (Out of character comments) or {thoughts/telepathy}. I think the NPCs will be adaptive and try to work with you on special characters. I'm not sure if any have a per-established meaning like asterisks do for emoting. *shrugs*