I checked my Version of BES10, and, I also do not see a policy to disable the camera - the amount of policies availible is indeed very small compared to what BES5 is able to do. Regardless if blackberry is telling they are proud that they have cleaned up things which are not needed, some things are missing IMO.
Maybe with the arrival of 10.1.xx -which is not far away- the BDS service will get an update which improves ths situation ?