Well, in my experience the double-click-convenience of .bat files (due to their default cmd.exe association) is the reason people do this, not just the execution policy.

To sign a script you run:

    Set-AuthenticodeSignature foo.ps1 $someCert

and make sure that $someCert 's pubkey is available on every user's computer.

The alternative is of course to get every user to run `Set-ExecutionPolicy Unrestricted` to solve the "problem" permanently.