Other scripts may call on those spells, so removing them is a non-option (short of locating and changing all dependancies. You could just edit the spell script, adding an impossible "if" statement around the execution function.
Code:
int i = 1;
int o = 2;
if (i ==o)
{
/// whatever spell does goes in here
}
for setting skills, use "[set skill skillname 120" to override on a specific person from within the game.
otherwise, write a command:
generate a list of Mobiles
if the Mobile is a PlayerMobile
if x skill is >= 100.0
x skill = 120.0
then execute your command as an admin in the game.
As for the robe, I'd suggest searching in script releases. here's a tip: the forum search sucks, go to google and type:
site:runuo.com Faction Robe
It will only return results from the listed site and does a much better job of indexing than vbullitin. It also allows standard opperands to be passed to the search "Must contain", &and, -Not, filetype:??? etc. makes the archives usable again, they even have it cached.