While learning Bongo Hills today I found this clip through the slanted white platforms in Bongo Hills Screen 1.

I don't know if this is already known, or if this is possible with all slanted platforms in the game that have ice-physics. It happened multiple times, but so far it feels pretty random.

I mostly agree with this. Especially levels with tight timing or difficult strategies right at the beginning (e.g. Swamps, Moskito's Nest) would get very annoying if you have to go to the shop and back after every restart, not even accounting for the ting grinding. I'm still a bit unsure though if outright banning it is true to the mind of speedrunning; this would technically suppress better times that can only be achieved with the Fist Pack. And Fist Pack would also certainly make some parts easier, even if the time doesn't change. Maybe there should be an additional category specifically for levels where it makes a difference? I'm personally not planning to use the shop in my runs, so maybe this won't matter anyway until a runner actually decides to use it.