Disable automatically adding words

How can I adjust the settings so the keyboard doesn't automatically add words to my dictionary? If I type in someone's email address one I don't want it to automatically store it. If I'm saving a file with a specific name, I don't want the keyboard to store the alpha-numeric-symbolic data. I don't want there to be foreign first and last names by default in my dictionary.

My perfect keyboard would have only the words from the English language dictionary and it would ask me if I wanted to add a custom word to my dictionary. If I wanted to add in other words, I could download and manage the dictionaries in my account, for anatomy, for science, for hobbies, for modern linguistics and slang, etc. If this isn't the keyboard for me, where can I find one?