There's a mod that does this. Vanilla Tweaks. Not 1.4 compatible though obv.I approve of this. It would be a great supplement when getting a pyramid in the world isn't all too common. Even then, you either have to either dig or load up TEdit to really know for sure sometimes.
I agree to this. Pyramids should have two to three chambers in them. It would also help in less overall world clutter by having fewer pyramids in odd worlds where they would otherwise spawn five or six of them. As for the Pharoah set, I would like to see it become a beginner's summoner set i- something somewhat minor with a total of 15% summon damage, +1 minion and maybe only 5 or 6 defense total.