I agree 100% conan. This software has all the bread and butter but has no way of reminding your users to come back other than an e-mail sent thru the board.
I would imagine something like this would require a cron job to run though so jelsoft might not do it.
I for one think they should release "modules" that simply "plugin" to vb and if you cant use them then you cant use them

Similar to what phpshop does
~Chris