At the moment a user needs to add several repetitive or long arguments like --auth or --direct-domains flag. This can result with a very big command that is prone to having errors.
An easier way of managing this is to specify a json file that has all these flags in some format and read them from there.
This can make changes easier to see and even version controlled.
Sauce Connect now supports YAML config files. This functionality is supported from version 4.5.0. Please review documentation about -c option at the below link.