Looking at that WP electric oven, you see how they used the basic gas builtin structure to have another oven where the broiler compartment would be in a gas oven. In some electrics like the Suburban, the lower compartment had a broil element and a drawer that pulled out like in a gas range, but it had a complete thermostat that went from Warm to Broil. I never looked at one closely enough to see if there was a bake element under the drawer assembly.
That control with the inner and both switch was a thermostatic unit. Note the warm settings. There were fry and boil settings above that on the dial.