Hello,
You are correct - after you add the snipe into our system, we do all of the rest.
The manual refresh is a feature we added because in our contract with eBay, we agreed that we would not poll their systems too often. We refresh four times a day. And, as a result of your inquiry, we double-checked and found it had been turned off! So thanks for that. :-)
You can change the lead time by re-entering the snipe again.
Three seconds is safe. For the lead time, no one has reported any 3-second misses since we introduced that feature. We were the first service to offer that, and then everyone else copied it. Fairly soon, we're going to announce 2 seconds and watch everyone else copy it again.
Here's some more information to help you choose your lead time:
https://bidslammer.com/help/minimum_bid
TL;DR: For expensive items, use 7 seconds instead of 3.
Let us know if we can help further, and good luck sniping!
bidslammer