Hey Folks - updating here - at some point obd11 updated and it's now giving me access to more data than before! This is all available through the "chart" view in the brake module.
I'm assuming the more data you log, the slower the update rate, but haven't yet confirmed. With all 3 i'm getting about 4hz, I assume just brake and throttle would get ~6hz. There are plenty more input signals here too, if you're interested in revs/boost/haldex engagement/etc. they're there. Given the sample rate it's certainly not the equivalent of a full-blown telemetry system, but it's a tool most of us already have. Combined with gopro GPS I can get a ton of lovely data and fairly easily sync it up (first braking point or a launch are good triggers).
I've confirmed this data works well with RaceRender, but don't have any example videos yet. I'll try to take one driving around tomorrow.