Indeed, what shaun said, some indexing services do not have the drip feeding functionality via API, this feature would compensate for that, I'm not sure exactly how though.
There are no recommended settings, it depends on your strategy.
Some of my tests right now are based around building the whole three tiers in a week or so and then sending them to my indexing service to be drip fed over xx days. Some of my other projects are being built over the span of 30 or 60 days with their verifieds going streight to the indexing service to be processed although this is a mistake as its wasting a whole bunch of credits with the indexing service due to link loss but I am thinking of making holding projects to hold the links for a week or so, reverify them and then send them to the indexer.
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Shall I tick this option?