About Group add-on: The only add-on out there (for XF1) which really can be called a Groups add-on (In my opinion, I don't say the other options are not good. I just say based on my expectations), is by @truonglv (formerly Nobita). Though it was/is badly buggy! and very very very slow update (which usually are buggy too). Recently he had some speed up and brought some good updates. He ported his add-on to XF2 but as I also mentioned in his site, if he doesn't bring the XF1 version's feature + a few must-have features to XF2 version, I won't use it anymore (and so, if another good developer bring something similar or better, with better support and faster updates, I may think about move in)