Yeah, evasion and mettle should be restricted with some common sense house rules.
As with a Reflex save for any creature, a character must have room to move in order to evade. A bound character or one squeezing through an area cannot use evasion.
the two should be restricted
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How would mettle interact with the orb spells? I don't think making your fort save is supposed to allow you to negate all the damage it deals, does it?
It seems that it is more of damage first, then the target makes a save to see if the secondary effect applies or not. Meaning that mettle would be useless in this context, as the damage cannot be prevented since it has already occured...