rc.local config question

Hi All,
I'm trying to set up the confirm package for one of my mailing lists.  
In the directions it says to uncomment rc.local.s10 and create a 
matching file containing the confirm code.

However, I currently use rc.local.s10 to insert the list name into the 
subject line of all messages distributed by the list.  I am also using 
rc.local.s00 to block attachments and rc.local.s20 to add a footer with 
unsubscribe instructions to all list messages, so all the default 
rc.local file calls are in use.

Is it possible to combine any of these functions?  For example, if I 
pasted the code from rc.local.s10 into the bottom of rc.local.s20 would 
it be able to perform both functions (inserting the subject line and 
the footer) within a single rc.local.s20 file?

As an alternative, can I just create another rc.local.sXX file 
(rc.local.s30?) and add the call to rc.custom?

Thanks,
Irwin