Chad,
I’m sure we will allow the lightware to be used on the Pixhawk’s 2nd I2C bus. It’s not a large change but I can’t immediately guarantee when we will enable that. The issue has been raised here. I suspect that will go into an AC3.5.x point release but I just can’t promise it immediately.
I’m not aware of any issues using the 2nd GPS on the PH2… I’ll have a look around but if you have a link to an issue…