This seems like a very random grouping of topics for a post.
That said, you have some interesting points. I for one was hacking EQ without 3rd party programs since very early on. My friend and I always played gnomes and we called it "gnoming" when we would exploit in one way or another, often discovered on our own.
Examples included:
1. Widespread use of camp/comeback bug that would let you go through walls.
2. Charming caster NPCs then breaking charm as they are in the process of nuking another NPC in a zone with separate factions. This sparked wars of NPCs of which you got all the exp for if you were on the aggro list.
3. Glitching NPCs onto geometry that made them unable to do anything, and killing them.
4. Summoning thousands of cleric hammers to kill elemental gods.
5. And the list goes on...
And don't forget the fun things like intentionally getting epic pets charmed by npcs, several times. It always surprises the guy who pulls Tserrina in TOFS

. Or how about glitching rogue pets on top of respawn points in newbie zones? Fire was my favorite. Soandso spawns, is hit by ice comet.
You can detect when someone uses MQ to warp, etc. It is much harder to catch a creative gnome

.
That said, I think the best thing to do is not give huge threats about what you will do to someone if you find them cheating. That simply eggs them on and invites a challenge. If you find someone cheating on your server, just delete their toons and ban them and don't say anything about it.