but it would be nice to have a way to control it.
You can already (indirectly) control it — at least in the direction of forcing the use of the shell. Just add a dummy ";" to the command (which should always be possible without changing the semantics). Or simply call sh -c "..." yourself.
(And be sure to add a comment regarding the ";", or else the next maintainer might remove that seemingly superfluous character again... :)
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