Locking objects

[AndMrzv]

There is an idea of being able to prevent making changes to a rack or device for a case when it has to stay exactly like it is for some time. It is not the same as Reserved or something, it can be fully in use, I just don't want anybody to change that specific rack or a device. Techies will see that it is locked and won't for example add/remove any devices (even dummies).
So far I come up with using a customfield for storing lock status and a custom validator for blocking changes if the customfield is set. Is there any better way of doing so I may be oblivious to?
Thanks.