What punctuation is missing from English that might solve your writing issues?
People may be able to come up with established ones that meet your criteria, such as the /s to indicate "that last bit was sarcastic," but what punctuation confusions would you like to solve?
I see a related question of "how would one use punctuation to indicate tone changes?" and "indicating different modes of speech, both translated and telepathic" and "how to indicate the slightest pause in dialogue."
Perhaps English needs to add something, typographically. (And we can make it catch on!)
I'll answer with mine, but I'd love to see more.