Now you have to add them manually. Why not add them by default?
Default add parameters for custom protocol process flows
Software Factory
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Nice idea!, although the domain selection would be a little challenging. Which domain should be automatically assigned? Leaving it empty could be an option but that would require some modifications on our part.
Just create some new ones if they don't exist. Or use default ones like tsf_request_body and tsf_request_method.
In my view we should automate these things more. Sometimes just choose something that'll work for the user. I think not a lot of people would be fussed if you created some default domains for these fields.