I have always indexed all tiers going back years, never did me any harm. In a split test sites with tier 1's indexed got rankings quicker than those that didn't. Test for yourself is the best advice.
Disable ping on SER is better in terms of speed. But i really recommend you test for yourself, @davbel gave you his opinion and i gave you mine but both are based on experience and really there is no substitute for that
Answers
cool to Ping and index other tiers? or if I use GSA I dont need to use the ping section.
In a split test sites with tier 1's indexed got rankings quicker than those that didn't.
Test for yourself is the best advice.
But i really recommend you test for yourself, @davbel gave you his opinion and i gave you mine but both are based on experience and really there is no substitute for that