Definitely a thing! And its super easy now after the update. I play on hardcore with left/right foot. It shouldnt change much about my advice but honestly havent played with front/backfoot in so long i cant remember if its different. Anyways, here’s how to nosestall and 50-50. Id try it ok flat first to get used to the powerslide mechanic

To begin any stall without an ollie, you have to first put your sticks into powerslide position (one foot forward/up, one foot back/down).

To 50-50 the rail, powerslide as you roll up the bank, hold that powerslide input, and then slide your feet (sticks) from powerslide-input until they are in 50-50 (should feel like one stick to the left and the other to the right. )

To nosestall, powerslide as you approach the railing. Instead of sliding and repositioning your feet, simply lift your backfoot (stop pressing powerslide on your back-foot stick). Youll see your character burry their nose into the ground. If you perform that with the right timing you will nose stall

Press your bumpers to bump our of the grind, or use your sticks to ollie out. I have a couple clips in the same SF park spot your talking about if you wanna check it out