A Wiz/lock's Spellbook?

[The Grackle]

My question is: can a wizard multi-classed into warlock, use his spellbook to hold the warlock powers? Both classes give arcane powers, which = "spells."

If yes, does that allow you one Power Swap:
a> one wizard daily (out of 2) for one warlock daily
b> two wizard dailies for two warlock dailies
c> player's choice
?

The wizard class-feature SPELLBOOK reads:

Each time you gain a level that lets you select a daily spell or a utility spell, choose two different daily spells or utility spells of that level to add to your book.

The Power Swap Feat reads:

You give up a power of your choice from your primary class and replace it with a power of the same level or lower from the class you have multiclassed in.

&

Any time you gain a level, you can alter that decision. Effectively, pretend you’re choosing the power-swap feat for the first time at the new level you’ve just gained.

***
It's not the awesomest build, b/c a Wiz/lock suffers from MAD, but as Int is a 2ndary stat for Warlocks, there are some nice attack options. And It could be worth it just for access to Warlock utility feats. If this trick works here, it should work for all arcane classes (Hopefully Int or Wis based) to come as well. Wizards would be great multi-classers b/c they don't have to sacrifice the versatility offered by the Spellbook for the versatility of multiclassing.

 

[Alkiera]

According to one of the WotC email replies I've seen floating around, when you swap a wizard power for another with an MC feat, you only swap one, even if it's a fighter power. You can choose to prep the fighter ability or the spell on a per-day basis.

From the reading of the Spellbook text, and the section on powers, it only mentions removing spells from your spellbook when you replace them via retraining or leveling at 15, 19, etc. But it says 'one spell' even in the spellbook section. So when you hit 15, you replace 1 spell in your spellbook(maybe 1st level, but it doesn't matter) with the 15th level spell. You leave other spells of that level alone. To get additional spells of 15th level, you need to 'retrain' to swap them out, at 1 per level. So at 15, you could have 2 15th level spells, if you used retraining to swap in the second one. At 16, you could have 3.

Hrm. From reading in detail; you get extra daily attack spells at 1, 5, and 9 only. 15th, 19th, 25th, and 29th are all basically 'free' retrains. Thus you'll only ever have 6 daily spells in your spellbook, unless you take the feat Expanded Spellbook, which lets you have 9 Daily spells. Similarly for Utility powers, you'll have 10; the powers you get from you paragon path or Epic Destiny do not count as 'levels where you get to select a spell' since you are given exactly one spell to take; there is not a choice.

 

[The Grackle]

According to one of the WotC email replies I've seen floating around, when you swap a wizard power for another with an MC feat, you only swap one, even if it's a fighter power. You can choose to prep the fighter ability or the spell on a per-day basis.

What? That's even crazier. Do you have a link? I don't see how you can prep an exploit when it specifically says to "prepare a daily or utility spell."