Quick question:
1: Can the protect block thing from thaumcraft wands be applied to anything?
2: Does the wither stop taking damage when you aren't near him even if the chunk is loaded?
3: Whats the fastest way to kill the wither?
4: also I try to spawn the wither with open blocks block placers but it doesn't seem to work until I break a head and replace it.
1) If you mean the warding focus, it can be applied to most blocks. However, I don't believe it works on tile entities.
2) The wither will take damage regardless of your distance from him, however, he does regen fairly quickly. This fact is sometimes exploited in vanilla to make tree farms and obsidian farms.
3) Pick your favorite weapon and go to town. If you keep the wither semi-confined, you can just melee him to death pretty quickly. Another decent option is iron golems (the vanilla variety) Stuff like turtles risk getting destroyed by the wither's attacks, but 3-4 golems should be able to kill the wither with maybe 1 casualty. If you want an automated system, MFFS may be the only real option.
4) Must be placed by a player. There's a few blocks in FTB now that simulate being a player, so pick your favorite.