Hey Dynamox,
I discussed this with elab who said that the safety mechanism is a "changes summary" dialogue which appears after you select your zoning changes. So if one of your colleagues selected the a zoneset from the wrong library, it would point out all the changes and they should realize its wrong.
If you still think its an issue then here is the process to log an enhancement request:
Log in to Powerlink and navigate to Support > About EMC Customer Service > Contact EMC Customer Service, then select "Software Product Enhancement Request" from the selection list. Fill out and submit your enhancement request and it will be routed to the proper development organization for consideration.