Admittedly, Nexus's stuff can be used by abusive persons. However, also considering the ways people have crashed servers with just vanilla eventing (I remember a drama topic back in time where one of the evidence pictures was raining tanks) the aditional details of a radar/buildbot can get stopped as well via other things:
*Buildbot and terragen are countered in minigames without building, mainly DMs and TDMs.
*Radar, while it's abusable in DMs, I can still see as relatively useful. A way to disable it serverside would work.
*Ya do realize you can save a dupe on the original duplicator, right? Admittedly not someone else's duplication but nearest maybe.