The first one would be nice, but I'd say there is minor issue with the other 3.
The second as mentioned already exists
The third removes an option to deal with him and would be a huge buff so would result in nerfs to another part of the kit probably. It is kind of like waiting for yi to alpha before dropping turrets as it currently stands, most low elo it will smite a normal turret and you can hot q then. Also ult q is strong as is, making it stronger seems like it would be a balance issue.
The fourth I would question what could be done and if anything needs to. Ult e is really strong engage, and catches people out in lane more than you'd expect. In high elo streams I think ult e is used more than any other ult option late game, at least from what I have seen. Although I think in lower elo ult q is way stronger bc people will sit on the thing to fight and that is just stupid lol.