http://www.d20srd.org/srd/skills/useMagicDevice.htmDnD 3.5 UMD DC thresholds wrote: Activate blindly 25
Decipher a written spell 25 + spell level
Use a scroll 20 + caster level
Use a wand 20
Emulate a class feature 20
Emulate an ability score See text
Emulate a race 25
Emulate an alignment 30
in DnD UMD, which is the skill that does all this business, using magic devices... determines... whether or not you can use them.
Why not use a more reasonable threshold for magic devices, roughly based on that and make them skill checks (IE, roll to use)
Breaking up UMD between two skills just makes everything starved, punishes non-humans, non-int based classes, and basically ensures that warlocks, druids, spellcasters in general rule the world with an iron fist