WhatsApp Black List cydia tweak disables the annoying notification reminder!
It also, lets you disable sending read receipts. You will find a new option to do this in Settings->Chat Settings->Do Not Send Read Receipts
Please feel free to email me with any additional feature requests.
*Soon the tweak will allow you to disable sending read receipts on a per contact basis. Also, I will be adding the ability to block contacts in more fine grained detail than what WhatsApp offers currently.
Configure options in WhatsApp