Access denied when registering SPJobDefinition

While testing some of our products on SharePoint 2010 I came across an annoying problem. Some of our products use custom timer jobs, and when trying to register such a job, say using feature receivers, caused a completely unexpected Access denied exception. I tried to run the code with elevated privileges, no use.

It took me some time, but I finally got it - in SharePoint 2010 you must register the timer jobs only in feature receivers scope to the farm or web application level. Although I can see some logic in it, I still find it extremely annoying that something that used to work smoothly under MOSS would be completely broken under 2010, no matter what the reason is.