Temperature sensors - which I2C should they use

[jmajew]

Recently, during setup of MATEK F405 WSE and I have run in to some kind of problem.
I wanted to add temperature sensors LM75 which by default talk with I2C2
and I wanted to use I2C1 since it had free pins on the FC.
Finally I modified the INAV firmware and after rebuild it works fine.

After all this I started to think about long term solution and I would like to ask:

• why temp. sensors are using I2C2 since I2C2 is use by (not counting temp. sensor): compass, Pitot sensor, rangefinder
  and I2C1 is used by: barometer, possibly LCD which is IMHO more trouble then it is worth. So it seems that I2C1 is less crowded than I2C2 ?
• is it possible to choose by CLI command which I2C should be used for temp. sensors ?