EDC 15 brings a function like this.
search google for the "funktionbeschreibung" Funktionsbeschreibung EDC15+ P127-PEA.pdf and look for the chapter "2.9 Arbeitsdrehzahlregelung". google translator will help you. If theres a part of the text which you can't understand, write here, I think i can translate it then. The advantage if you're German
edit: just saw, that it's an VE engine. Maybe EDC15V also brings this function. Again, the Funktionsbeschreibung and Google translator will help.