Ok, I've noticed some discrepancies in the way we're rolling things, and I'd like to get a few of those things squared away.

1) What sorts of checks do you (DM) *not* want your players rolling? Knowledge, Perception seem to be the big ones, but just to make sure we're on the same page (and prevent "but I rolled a nat'l 20 in the IC thread!!!" complaints) I'd like a clear indicator of what we're expected to roll or not

2) I have a concern regarding the rolling of stuff like perception... you (DM) noted who has the highest in the various knowledge/perception/etc. skills, but at the same time that means that 3/4 of the players' perception skills are ignored. Is that the intent? If so, then we can plan to not spend any skill points on those skills... but that seems to be an unintended consequence, and in the meanwhile the other 3 PCs aren't getting a chance to even roll. Thoughts?