Cheiromancer
Adventurer
I'd be hesitant to raise the caster level too high on the basis of the feats required; the prerequisites for item creation don't all have to be met by the same person. It could be that a cohort or another character would have the Craft Epic Staff feat, and perhaps the IMC and EMC feats, too. Or maybe the character has crafted an item (a ring, say) that grants that feat. That notion (items that grant epic feats) seems very ripe for abuse; perhaps we shouldn't assume it so readily. But a collaborating spellcaster - that should be straightforward to arrange.
Have you given thought to adjusting the rules regarding the time to craft epic items? I don't believe the default rule of 1 day/1000 gp has been changed, but I'd suggest something along the lines of 1 day/50,000 gp. I also think the xp cost is too high. Instead of 10,000 xp + 1xp/100 gp, I think it should be 6000 xp + 1xp/100 gp. This makes the new formula and the old formula coincide for a 200,000 gp item (both ways it would cost 8000 xp). Gold might be more plentiful for high level characters, but xp is just as precious- I don't think there needs to be an epic speed bump there as well. Special feats and extra gp costs is, imho, enough.
Actually, I think you should be able to make epic items with non-epic feats; just have them take 1 day/1000 gp and have an xp cost of 1/25 the market price. Epic feats would have an obvious utility if they allowed items to be crafted faster and more cheaply. And obviously you should be able to use an epic item crafting feat to craft non-epic items. You'd pay more xp, but it would be much faster.
Oh, and I concur with your emendation of Master Staff- it shouldn't be a way to evade xp costs.
Have you given thought to adjusting the rules regarding the time to craft epic items? I don't believe the default rule of 1 day/1000 gp has been changed, but I'd suggest something along the lines of 1 day/50,000 gp. I also think the xp cost is too high. Instead of 10,000 xp + 1xp/100 gp, I think it should be 6000 xp + 1xp/100 gp. This makes the new formula and the old formula coincide for a 200,000 gp item (both ways it would cost 8000 xp). Gold might be more plentiful for high level characters, but xp is just as precious- I don't think there needs to be an epic speed bump there as well. Special feats and extra gp costs is, imho, enough.
Actually, I think you should be able to make epic items with non-epic feats; just have them take 1 day/1000 gp and have an xp cost of 1/25 the market price. Epic feats would have an obvious utility if they allowed items to be crafted faster and more cheaply. And obviously you should be able to use an epic item crafting feat to craft non-epic items. You'd pay more xp, but it would be much faster.
Oh, and I concur with your emendation of Master Staff- it shouldn't be a way to evade xp costs.