[PD] editing $0-variables

[sme]

hi list, hi thomas musil,
with the iemlib i can take $0-variables as send/receive-arguments. (if i go
to the properties and type $0-receive). later, if i open this patch with an
editor it appears as /$0-receive. BUT:
how can i do this the other way round. i´d like to edit the name to
$0-something in the editor and have it set as $0- in the properties. in this
case pd replaces the $0 with  a number and i cannot save the patch
correctly... in the editor both appear as exactly the same, only when i open
the patch, the first stays $0- the other is replaced. or can i create $0 as
a symbol(...?) in a pd-patch?
marius.