IDE autocomplete - function parameters, automatic activation?

I note that CMD-P brings up function parameter autocomplete,

Is there/could there be an option for this to be automatic , e.g. activated whenever typing an open-parenthesis after an alpha-numeric symbol without any whitespace;

I'm actually using the Rust plugin (I usually use QtCreator with C++. I understand the rust plugin itself will have issues being a less common language. However I hope that Rust related tooling should be able to get better than C++,  due to the language being easier to parse

Request is welcome at https://github.com/intellij-rust/intellij-rust/issues.

For most of the other languages it already works automatically after parenthesis.