Sometimes I split workflows which are then started from one workflow.
Thereby data are transferred. However, in order to test the workflows themselves, it would sometimes be really nice to manually define the data directly in the start node.
Which of course should be overwritten if they are passed from another workflow.
Basically, it would also be nice if there is a parameter description directly what this workflow expects and is also displayed in the execute workflow.
A drop down with the worklfows (instead of the id) would also be very nice.
This is on the roadmap — I think any trigger node would benefit from having an option for sending preset data when testing 
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As a work around you can do something like this in the expressions:
{{$json["your_property"] || "Default value"}}
Does this work for you?
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