That's precisely the kind of thing that gives everyone who has any sense of safety nightmares!
Where I fly model planes, the new rules in place mean I have to call the local tower to get permission (after logging the request on the national "airshare" web site).
I recently asked a busy controller if it was a PITA to be constantly called by model plane flyers - her response was that it was better to be slightly inconvenienced and know what is flying where, rather than not know what is flying anywhere...