As noted in here that is pretty much it.
If you see something in another post you like and want to use it then just click on the edit icon (pencil) in the lower right of a post (may need to click ellipsis first) and look at the raw text, most of the time you can copy the formatting from there and it will work.
To get more advanced requires either knowing how to get some hand written HTML pass the Discourse checker which filters out most of the fun HTML, asking the admins to add features which is how I wound up as an admin (ref) and there are not many more features that we can add. The last option which we can not do with this site because of licencing is adding more plug-ins or custom plug-ins, unless of course you want to sponsor this site for a higher plan. 