Right now you have to use a precondition and two config entries.
For avionics we rely not only on the battery switch but on the avionics switch too.
Comparison right now only accepts the fsuipc for comparison.
Precondition Tab could be a place where we want to implement this. It requires that we can alter the value that is used during comparison. Something like
If my preconditions are not met then set value to the following value. I have the feeling that this is an intuitive and easy way to define this.