I'd suspect the reason that people don't do that to r/c is because the ends don't really justify the means. Just like few (if any) people drift in 1:1 cars anymore as a speed technique so much as it's just fun to do. Personally, i don't like drifting as a speed technique cuz it hardly last. I used to do it from time to time when I ran in SCCA events, but I rarely used it. It just wasn't worth doing to me. It's just taking a corner faster. With it, there's no angle, no slide, no smoke (or none worth mentioning). I'm also, (honestly) not good enough at it to be consistant in a time trial while using it. And that transfers to 1:10. I can drift well, along with a lot of people here, but it's more for fun and show than racing. That's just the path drifting has taken.