We need two ExP variable that each control:

• Is Auto visible in the Model dropdown
• Is Auto the default model. Though we already have one defaultModel ExP variable, so I suggest to check with @roblourens if these two would overlap, or the original ExP variable should respect the "auto" value

With @sbatten works to target ExP by SKU we can use this to make Auto visible only for a certain SKU (if we so decide).