Re: ellipsis/the dots-expressing feelings
Your "Rules..." does indeed convey unspoken thoughts on the subject of "rules".
The second example would be fine in the context of e.g. a series of articles on different aspects of grammar, each one of which kept to the same format:
- More about...prepositions
- More about...conjunctions
- More about...the anticipatory anaphora
In this instance, the ellipsis would express a pause for effect.
Ellipses are very popular in informal or unpublished English (e.g. emails, forum chat, etc.), where they take the place of a significant look or tone of voice.
In edited English of a non-frivolous kind, they tend to appear less frequently, except to indicate omissions; I suspect that copy-editors regard the "expressive" ellipsis in much the same light as the exclamation mark (i.e. as something that can be overdone).
In your context, though, they seem perfectly appropriate.
All the best,
Not a professional ESL teacher.