Aye, i was concerned about that. Though i'm glad you mentioned the re-direction rules as i'd missed them.
MOAR questions!
1. Same as above, if you are still interested in weighing in on it.
been there, done that *g*
2. would using evocation to place a maneuver on a willing ally still require a minimum of 3 shifts to be effective?
I'd say yes, 3 shifts is not really a lot, and in a conflict there needs to be the possibility of failure, like with all other maneuvers.
Outside of a conflict, well, if theres no downside to failing then theres not even a need to roll.
3. Re-reading the series, would you allow an evocation maneuver to split into two maneuvers (kind of like you can split an attack) i ask because When harry goes to visit mortimer in Grave Peril he uses a race bit of power to slam the door (actually that would be a block... probably...) and then says he uses the rest of THAT spells energy to also pull a chair up to him.
Doesn't really need to be a block, i'd actually think it's more of a maneuver.
I can imagine to rule this as a single maneuver placing a scene aspect like "The Wizard is in" which is then tagged in the social conflict that follows. Closing the door and pushing out the chair would be simply description.
If you rule it as a block, then you can go with the redirection rules once more. Close the door as a block with +1 duration, in the next exchange redirect the block spell to push out the chair.
You could also rule this as a "mundane effect", and not require any roll or stress, but then you don't get any benefit, rules-wise.
Lastly, there is the Spin rule. Having gained a lot of shifts on the door-closing-spell you could maybe rule that the remaining shifts can be used to push out the chair. Though Spin is technically only for mundane action iirc.
4. Narrative, damage over time maneuvers. Such as using an Evocation Maneuver to set someone on fire. Aspect: 'On Fire.' would this be applied to act similar to the venemous claws, where each round the subject has to roll or take damage? or would fate points be necessary unlike Venomous Claws.
Damage is done by attacks, not by maneuvers. The Aspect "on fire" does not include Fire Damage.
A DoT attack effect would require you to roll a new attack each exchange to "maintain" the effect.
Another option is to use magical grapples, see the Orbius spell among the Example evocations in YS.