Not Used: Let Dead Stalker semiclass use any mage attributes?

I was looking at potential semi-classes for my pure wizard, and Dead Stalker seemed interesting except for the fact that it only uses CHA for powerpoint allocations.  I'd think that any mage should have the potential to become proficient in positive energy manipulation.

So I was wondering if it would be still consistent enough with the concept of this semiclass to let the power point multipliers come from either CHA, WIS, or INT?

For power points, all the semiclasses use only a single ability.  Since dead stalkers are basically using a cleric's turn undead power (which is only affected by Charisma), that's the ability the semiclass uses for it's abilities.