That doesn't really help, because what we really want is perl in c:\our\favourite\path\perl.exeand another faction want to use c:\what\they\think\is\standard\perl.exe. We also want to avoid installing perl twice.
Actually we're pretty flexible about our\favourite\path, but what\they\think\is\standard is just abominable.
Oh, and we're not talking about one single machine, rather hundreds.