Hi Dave,
hope everything is going well with you.
regarding your question, if you don't want to see the DEV connectors when searching for the systems in production for a specific scenario, the only way to exclude them is by restricting the authorizations.
Try restricting the authorization object GRAC_SYS in your roles for the relevant scenario.
http://scn.sap.com/thread/3328001
Good luck.
Kind regards,
NJ