Override parameters at patch level - just mappings?

I know you can override mapping parameters from concert down to patch level, but can you override in any other context in MainStage? Eg can you set up a loopback channel at concert level and set the bar length at set or patch level. Or can you add a bit more reverb to a concert level vocal channel at a patch level? I know I can create those variations by positioning the relevant projects at patch level, but the lure of efficiency prompts me to ask if I can set at concert level and tweak at patch level.