Devo 10 with Deviation 5.0.0 Throttle Problem

This is how deviation works, now you have -100...+100 throttle range just like on all the other channels.
However if you want to display a 0...100 throttle range on the main page, you can use a virtual channel for it, which needs 50 as scale and 50 for offset, then use that virtual channel as the source for the main page box.

I wouldn't call it as industry standard, because there are examples for both ways.
Simply deviation doesn't really distinguish the functions, i.e. there is no dedicated throttle channel in deviation. It is only labeled to match the receiver labels...