If you had the option to add new features to your primary language, what would they be? Is there something from a foreign language you'd like to import to your primary language?

A couple examples:

• A prefix to indicate intensity or degree. BBS/early hacker jargon had terms like "k-rad" to mean 1000x (2^10?) as radical as "rad" without the prefix.
  That Montessori preschool was t-cool but why would they think calling it "Hobbledehoy" was a good idea?
• Making an indication of how confident you are in an a statement obligate and easy. I hedge all the time because I think it's important to convey, but it's clunky. We do a bit of that non-verbally but that doesn't translate to text, and has the other complications of non-verbal cues.
  It would be nice if there was an established vocabulary to quickly convey things like "experienced first-hand, repeatedly", "99% certain", "I've heard but never looked into", etc. From there it would be nice if this was as required as the gender, in gendered languages.

Habits can be good! I mean, if you build the good ones of course. But ya know, sometimes people fall into habits that annoy you. I mean, they probably don't know that they're annoying you. Or that they've fallen into the habit at all! What linguistic habits have you noticed in yourself (or others) that drives you up the wall?

For me, it's definitely the topic particles in Japanese. It just seems like a really interesting thing that is a reason enough to want to learn Japanese, even excluding other great features it has. Here some info on them.

Three examples :

American English have lost the u in word like "color", because it is closer to its phonetics (the u is silent and there's no particular sound associated with "ou"). The letter u has an anglo-norman root.

Swiss French (and for this particular example Belgian French) differs little from standard French, apart from the numbering system. It is ironically more metric than standard French since it streamlines what's left of the base 20 (vigisimasomething) system, i. e. it's "seventy and eighty" ("septante et huitante*") instead of "sixty-ten and four-twenties" ("soixante-dix et quatre-vingts". Historically people all over the world used some sort of base 20 system, probably because we have twenty toes and fingers.

*no one ever use "octante". Belgian people think the Swiss uses it, while Swiss people thinks the Belgian it. I don't know why its that.

Swiss standard German (not dialect) have ditched the Eszett ligature (ß) in favor of a more simple "ss ". That ligature was more common in the middle age.

With those example in mind, do you find value in the "old" vs the "new" way of writing?

(in other words: spelling reformer partisan and opponent : what goes through your mind?)