I think it would be helpful if Amnestics and their various classes were standardized in much the same way Object Classes are for the sake of internal consistency, even if this was simply establishing a ladder of potency. Would serve to lend perspective to SCPs that mention them, as opposed to merely being a bit of technobabble to do away with pesky witnesses.
(Hit Ctrl+F, search for "wiping the slate clean." Interesting read.)
Second thing I suggest be standardized is __-Class Scenarios/Events/Whatever. I think it'd be helpful for writers, new ones in particular, to have an idea of what's available to play with. Would also be helpful for internal consistency, but more importantly, possibly inspire novel SCP ideas as opposed to innumerable things what end the world.
That's not to say I'm suggesting the list of Scenarios as a be all, end all, "If it's not here, you absolutely cannot do it." Just a point of reference to help get creative juices flowing. Presumably, the Foundation has one kicking around somewhere, and given some of its contents would be hypothetical, it's perfectly plausible it be revised and appended as time goes on.