This ticket has been open for more than two-and-a-half years -- solely on the basis of an ancient inline comment. In that time no one has produced any evidence that we are doing the wrong thing. Given how many of our developers are currently working on AMD64, I would have expected that by now some evidence of doing the wrong thing would have emerged.
I am therefore taking this ticket, removing the inline comment from config/init/defaults.pm and resolving the ticket. Wayland, if you get around to testing the install paths on 64-bit and we're doing the wrong thing, please open up a Trac ticket with full details. Thank you very much. kid51