Calling scenario from another scenario and creating a new step

[s-cordo]

Hi Dataiku Community, 

In my use case, I've got 3 scenarios (scenario A, scenario B, scenario C) and one 'main' scenario that calls those scenarios. All of those scenarios are 'Custom Python code' scenarios. 

Basically, my 'main' scenario looks like : 

import dataiku 
from dataiku.scenario import Scenario

main_scenario = Scenario()

project_key = dataiku.get_custom_variables()['projectKey']
scenario_ids = ['scenario_A', 'scenario_B', 'scenario_C'] 

for scenario_id in scenario_ids:

    scenario.run_scenario(scenario_id
                      ,project_key=project_key
                      ,asynchronous=False
                      ,fail_fatal=True
                        )

Scenarios are well triggered and are defined as step inside my 'main' scenario 

However, I did not succeed in passing parameters to the called scenario using the scenario.run_scenario() function. So I used the scenario API just as below : 

import dataiku 
from dataiku import api_client

from dataiku.scenario import Scenario

main_scenario = Scenario()

project_key = dataiku.get_custom_variables()['projectKey']
project = dataiku.api_client().get_project(project_key)

scenario_ids = ['SCENARIO_A', 'SCENARIO_B', 'SCENARIO_C'] 

for scenario_id in scenario_ids:

    scenario = project.get_scenario(scenario_id)
    params_to_send = {
        "param1" : "var1"
    }
    scenario.run_and_wait(params = params_to_send)

My scenarios are well-triggered with parameters, but scenarios are not a step anymore inside my Main scenario. Scenario details are empty :  

So, here are my questions : 

1. When using scenario.run_scenario() function, is it possible to pass parameters to the called scenario ? 
2. If not, when using scenario.run_and_wait() function, is it possible to consider the scenario called as a step just like scenario.run_scenario() function does ? 
3. More globally, and I thinks it's related to this post , is it possible to create custom step when creating a custom python scenario ? It could avoid to have empty Details section and to have to go to the logs...
   Or maybe existing a function to print relevant information in the Details section without creating a step. 

Thanks for your help

Sylvain