Regarding to SJ1 and SJ2 in this schematic:
On the board it looks like two ordinary copper pads but with a thin connection between them. Is it meant to be a way to open the circuit by scraping off the copper between the two pads?
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It's a solder jumper. Just like two header pins with a shunt cap, but cheaper and more permanent. Bridge with solder if the connection is desired.
I'm not sure why you wouldn't in that case though unless there are I2C pull-up resistors already present elsewhere on the line. Seems like it would take the same amount of effort as just removing/not populating the pull-up resistor.