The wand should be able to change angle relative to the book. The way it is would be fine for laying down flat. However, if you want access to all 4 effects immediately in battle, then the wand should be perpendicular to the face of the book. Then the caster can immediately go from reading the Tome to sighting down the wand simply by raising his eyes.
Alternatively, casters employing dynamic staff styles could align the wand with the shaft of the staff. Either go front to front to enable wand use with direct thrusts, or reverse the wand so it works like a double weapon. Of course, this style wouldn't work so well with the book, but since that's been dropped anyway...