Most websites allow you to hit enter when in a form element, or when the submit button has focus. This allows for much faster data entry - at the moment for example I am updating over a hundred tenancy special conditions. I have to take my hands off the keyboard, and use the mouse, then find the ADD button.
This is actually part of the W3C accessibility standards - https://www.w3.org/WAI/perspective-videos/keyboard/ - and would be immensely useful if very basic changes such as this were looked at.