My practice it to use mixed case in subroutine names or to use both & and () when calling my subroutines. See (tye)Re: A question of style for more details.

    print &q("calling a subroutine"), $/;
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And, no, you can't override q//. You can override things like open. And you can tell this because prototype("CORE::q") returns undef while prototype("CORE::open") returns "*;$@". See prototype.

                - tye