Yeah, that neutral finder is a swell convenience. One might also say it's pretty much a signature feature of the Royal Enfield brand, which makes it a little bit odd that they didn't try to squeeze one somehow into the later 5-speed boxes, like mine has. Don't get me wrong: I've been perfectly content with my 5-speed. Being my first "lefty", it took a while to get used to, but it's just fine and dandy. Having been designed from the get-go as a lefty, there aren't a lot of sloppy Rube Goldbergesque workarounds to get the shifter over onto the left. I'm still not entirely clear as to exactly how or why that left side was Federally mandated. I'd been perfectly safe and happy shifting on the right most of my life. In fact, I've still got two old rides I'm working on that are righties, a ratty '67 Norton N15CS 750cc "Desert Sled" and a '57 198cc Zuendapp Bella R201 scooter. The scooter even has a sort of see-saw shifter, so that it can be easily operated wearing a pair of pumps with big stiletto heels...which is a good look for me that I think I can pull off without looking "trashy".
I'm led to understand, never having actually ridden an Enfield 4-speed, that there's not a lot of difference in top gear between it and the 5-speed, but that the jump between 3rd and top gear in the 4-speed is quite a leap. Still, that might well be a sort of virtue and part of their charm, perhaps giving them a more "luggy" visceral feel. If yours is sloppy, then I believe you may have chosen well to go back to its original righthand configuration instead of trying to tighten up some silly-ass mysteriously mandated nonsense.