I also learned f/s boards before b/s. It's always a favourite trick of mine, I can barely slide them now though. It's the only trick I've ever done down a handrail, and that was sketchy as fuck.
There's a photo of Ronnie Creager f/s boardsliding a flat rail, and the photo was taken inside a restaurant - you can see him through the window, and all the patrons are looking at him. It's such an awesome pic, but I can't find it anywhere. It was from his TWS spotlight back in the early 00's, Seu Trinh took it. If I find the mag I'll scan it.