|There's more than one way to do things|
Yes. I've added:
just after the use vars: where it is declared.
The reason for asking if there was an official way of disabling it is because at the top of the shell() method, there is this line:
which implies that $Suppress_readline could somehow be defined prior to the test on STDIN.
I couldn't find the mechanism whereby that might occur--barring your way of setting it on the command line--, but had there been some existing mechanism (maybe an environment variable or similar), I would prefer that to modifying the script directly.
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.