I You can not lodge a lump sum into the Regular Saver. It is only intended for regular lodgements paid in by standing order. The amount lodged can not exceed 50,000.
Of course you can put in lump sums. I have had the account for about 4 months, and using internet banking put money in and out of the account as often as I like, and for whatever amount I like, whether that is 100 euro, or 1000 euro. No standing order required. There is no closing date on the account for lodgements ( which the aforementioned tracker 1 and 2).
I think this product is a handy product for dumping surplus cash out of my current account - using internet banking, and this is particularly relevant for people who have existing current accounts with NIB.