Literally 9 times out of ten that I want to install something I cannot because packagekitd is locked. In close to 15 years of using Linux, no other distribution has ever constantly prevented me from installing software so often! Command line or GUI, makes no difference... Kill the daemon and you have a few moments to do something or it restarts

How often does packagekitd really need to lock?

So a) can I safely disable packagekitd and if so how?
Better still, b) can I have packagekitd only do anything, say once every 12 hours?

Just to make sure that I am not being grumpy about this!