Is there a better system?

I ASSUME the system was fitted by the Ford dealer, because Ford's LPG engine is a dedicated LPG system. Almost all dual-fuel systems fitted to cars after 2003 will be injection systems that start on petrol and switch to LPG after a minute or so of warming up, so yours sounds as if it's state-of-the-art. They operate that way to minimise the starting time and for smoother running during the warm-up phase.