Allowing email addresses with % in them

[Stephen Paul Weber]

I have reason to allow email addresses with % in them.  If I do this:
        allow_percent_hack = no

Then I still get "relay access denied" because it seems that Postfix 
considers % a relay attempt, even with the rewriting disabled?  So, if I do 
this as well:

        allow_untrusted_routing = yes

It works, but of course I'd rather not.  So two questions (1) is this 
"safe":

        swap_bangpath = no
        allow_percent_hack = no
        allow_untrusted_routing = yes

That is, since both bangpath and percent_hack are disable there should be no 
untrusted routing to attempt anyway, and thus I am not an open relay, yes?

And (2) is there any way to acheive what I want (localpart with % in it that 
is treated as just a normal character and not a relay attempt).

Currently running Postfix 3.4.5 (Debian stable).

Thanks for any pointers!