Using a Rift S, when I click the tome my controller vibrates. When I try squeezing the right trigger and throwing, nothing happens. Tried also squeezing the trigger while holding the want over the glyph and then releasing in the air but I couldn't manage to get it to work. The right thumbstick triggered powers work fine and cast from the wand as I believe they are intended to.
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Barring this is a bug, these are the steps you would take to cast Tome Spells.
Tap the end of your wand onto the tome you want to cast.
Pull right trigger and hold, spell should fly toward end of wand.
If you let go before it reaches end of wand it will fizzle out.
While still holding spell, flick wrist/throw arm/etc and let go of trigger when you want to throw spell.
Doesn't seem to