I have my scheduled jobs set up to automatically prune my db and pings are set to Asynchronous in my Global Settings. All seems to be working fine in my public blog.
In one of my test blogs, I have the Ping b2evolution.net and Ping Ping-O-Matic boxes unchecked in the Advanced settings, but every time I create a new post in that blog, it creates and executes a Send Notifications job for that post.
I can't tell for sure if the pings are being sent or not, but I would think that unchecking those boxes for individual blogs should prevent the unnecessary creation of scheduled ping jobs.
In short, I'm questioning whether the Asynchronous Pings Global setting is honoring the individual blog's request to NOT ping certain services. I KNOW it's honoring the setting when Pings are set to Immediate.