Gosho makes the same things over and over and over. He should make more complicate and actual cases of murderers, rapes, these kind of things. And make a grand finale of this great manga.
PS: I think he should do a side-story about Heiji & Kazuha
I don't think he will ever do sexual assault cases because it will be too inappropriate for shonen manga, especially when his main character looked like 7 y/o (despite conan is actually 16-17 y/o). Not like murderer case are appropriate for kids, but rape is just ... too mature and will be harder to explain for young reader. I agree gosho should stepping up for the next cases though
Extras yes. The rest better not