sometimes when i try to hide a polygroup (CTRL+SHIFT +click) it hides a polygon ring … this would be really helpfull if i could control it. anybody knows whats the real hotkey for this cool thing? i have been trying and it seems it happens more often if i try to press first ctrl and then shif and click at the same time and only in lasso selection mode.
-------edited-----
well i think I got it… to hide loops or rings of polygons you have to be in lasso mode and ctr+shift+click right in the egde!! this is so cool but i wonder why it was so hiden. or did i miss this in the documentation?
Yes, you got it. 
It is probably not as clear in the documentation as it should be (I’ll update when I have a moment). I did mention the technique along with some edgeloop stuff you may find interesting in this thread:
http://www.zbrushcentral.com/showthread.php?t=95850
thanks a lot marcus