I'm working on a project where the architect (again) switched grid locations (this time moving them from face of wall/column to column centers). He did it using Move with the Disjoin option checked. It would be great if it popped up a dialog saying something like "Disjoin Warning: Using the 'Disjoin' option is like making a copy and deleting the original and will therefore BREAK ALL COPY-MONITOR RELATIONSHIPS in addition to Dimensions, Columns on Grids, etc. Consider changing the Column properties (for the sake of your consultants) instead."
I just learned about this feature, then promptly learned why I hope no one else will ever use it... The dialog could come up once per session, but even if it comes up EVERY time the feature's used I think that would be fine, too - after all, we put up with the Audit warning EVERY time that's checked even though that only adds a few seconds to the open time (less time than closing the dialog costs, IMO).
And yes, I know this could be fixed by simply educating users, but this usually is only discovered AFTER the feature is used (and impacts us when it's used OUTSIDE our company, so we can only educate others after the fact).