You are able to create and place a footings using the slab tool. The Slab tool automatically includes a footing, To access the footing options in the slab tool select 'concrete pier and beam' - See image for more details
The user isn't able to select none for the studs at the moment when using a brick core filled wall or any other type of wall, we are working on fixing this now and even though you can't select none the studs won't be drawn in the model as the software recognises that a brick core filled wall does not need studs. it's only a little bug that that will be fixed soon. When you select none it will choose a timber size but it won't actually draw the timber studs or estimate the studs.