What's wrong with a plugin? Construct has a keyboard object by nature. Mostly it's enough for the most common things.
So no, you don't need extra plugins to use keyboard functions. Just for that few extra symbols. And if construct isn't adapted to your needs, feel free to use another software. But don't complain about things, you don't even fully tested.
Sorry, but I just don't like it, when ppl don't appreciate good work...