I have a prototype sort of finished but nothing ready to release yet. Development on that has been rather slow.
Glad you like SIF and SS! I have plans to write a MySQL module for SS that will store all the account data (character/inventory data is a little harder as current SQL implementations for SA:MP aren't very flexible when it comes to large sets of binary data. But I'll figure it out when the time comes)
I am working (slowly) on abstracting most of the code to proper modules with an API that will make chopping up and integrating the gamemode code with other things easier.