It really depends on preference. Forward lean can help you edge a bit better on your heel side. However if you're not having any issues with heelside edging, you probably don't "need" any forward lean. Maybe it will help you. If you are park riding you can have a little forward lean, but probably none at all. If you feel like you're having issues doing heel edge carves quickly while free riding, increasing your forward lean can help that. It basically pushes the board back onto the heel edge sooner than if you had no forward lean, just making carving easier on your legs and maybe a bit more fluid. I've never ridden with any forward lean, even when free riding and I haven't had an issue with carving.
I'd advise playing around with it, as it's just a preference thing, and you may find that forward lean fits your riding style.