No spoiler ahead, but a little time ago I was thinking of writing a all-purpose command spawner with all the missing features we currently have, including arbitrary placeholders, environment modifications, selectable stdin/stdout/stderr, etc. It should actually be fairly easy to implement the feature itself with the new spawn API we have, and it'd be a "mere matter" of writing a nice configurable UI for that. If I get time I'll try to work on that further.
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