The hand rotating of the fan is someone's genius idea that is not supported by the manufacturer of the engine or the airframes (airbus or Boeing)
Nowhere will you find a procedure that says grab the fan and give it a whirl on the walk around.
As someone rightly pointed out it can't be such a big issue because it can't be done on the bigger engines that you can't reach or on the cfm56 (or any other engine you can reach) when there is a breeze and the fan is windmilling.
Fill your boots if that gives you a warm and fuzzy but don't label as dangerous or irresponsible (or fat!) those that don't agree with this home made procedure.