It would by nice if you can pass extra params in build pipeline step, i want to pass params from one pipeline to another and these params are not defined in pipeline parameters.

Our case:

We triggering a gating job pipeline from Gerrit, so triggered job get's GERRIT_* parameters automagically. In this pipeline we want to trigger another pipeline which needs GERRIT_* params as well. But we cannot pass GERRIT_* parameters by code lower because those parameters are undefined in triggered pipeline.

build(job: "testJob", parameters: [
 [$class: 'StringParameterValue', name: 'GERRIT_REFSPEC', value: "2485/12"],
...

Passing undefined variables produce no error.

Another option is add possibility to affect triggered build ENV.