For those who are interested in what led to this thread:
I had created a group based on my favourtie Black Cauldron characters - Gwydion (inquisitor), Taran (ranger), Doli (fighter/thief), Fflewddur (skald), Eilonwy (cleric) and Dalben (sorceror).
1) I had originally wanted to fix Dalben's stats such that he would have smtg like 25 Int, 25 Wis and 23 Con (I thought it quite fair, after all he is supposed to be really wise and powerful although not in the physical sense - to balance, I set his strength at a pitiful 9)... sadly, the edited game crashed last night

. Probably a case of overkill
2) The ring of invisibility has only 1 charge per day and I have 2 of those. Doli couldn't hide in shadows even though I set his ability at 100% and made him wear Night's Gift +5 which is leather. That meant he couldn't really backstab at will, so Bahamut had suggested that I try using Shadowkeeper to give him the option to go invisible at times. But as you can see from this thread, it doesn't work either.
Looks like Shadowkeeper isn't that great after all...