If I name that config file something.auto.rsc and copy that file from an FTP server on a router, then it should be auto-executed on that router as soon as it gets there right?
Ah
As far as I have understood this, I'd say 'yes'.
I was playing around with exactly this idea last friday - and experienced that scripts named xxx.auto.rsc are NOT automatically executed when fetched by the receiving router.
I don't know if this is either by design or a bug in either RouterOS or my brains...
In your case I'd see a netwatch up-script (be sure you're not looping the script) or a schedule on startup (maybe starting with some seconds delay to ensure it got its IP address from DHCP) for this.
-Chris