Hi Kawai,
if a customer wants to use a pull up or pull down resistor he can, even if the resistances are not requested. The I2C addres of the device needs to be fixed, in the DS we suggest to tie the pins to VDD or GND.
ADRx pins are input digital pins so the amount of current which could flow is negligible and there isn't any risk to create weak pull down and pull up even with high resistances.
To be honest I do not know which is the highest value of resistance that you can connect and I do not understand which is the benefit in this kind of topolgy.
Regards,
Domenico