Not using your particular ROM. Nor will the majority of people reading this thread. Wouldn't it make a lot more sense to ask in the support thread for that custom ROM?
Alternately, what you are trying to do is usually referred to as reverse tethering.
So look in the Play store for reverse tethering apps e.g. this or this.
The OP prolly can't post in development threads due to post count.
And what they want is NOT reverse tethering. Reverse tethering is using the computer internet on the phone. Meaning, the phone does not have a data connection or a wifi connection and wants to obtain internet through the USB port (meaning computer)
What the OP described is the proper way to tether the WiFi connection of the phone to the computer. Not sure why its turning off his WiFi.
OP, if you turn on USB tethering and disable data, then turn on wifi, what happens?