1. Play across all screens in normal 2d mode with 1 big 5040x1050. I assume this is straight forward plug n play.
This'll work just fine, yep.
2. Play 3D on middle monitor having it's own resolution(each monitor would have it's own resolution), the game being windowed/maximized mode, allowing the 226BW on either side to but used for other things.
Nope, sorry, but you could do this if you were using the iZ3D driver and using anaglyph (blue and red) 3D.
3. Play across all screens, having 3D in the middle and 2d on each side monitor.
Nope. This is a single large surface technology.
Suggestions,
1. if you want 3D and you want it now and free, look up iZ3D and pick up a pair of anaglyph glasses.
2. Get a new motherboard, another Card, 2 other 3D monitors of the same type as the one you have, and wait for drivers. Sell the two other monitors and the TH2Go.
3. Connect the 3D monitor to a free port on the card and use 1 screen 3D, but you cant do surround at the same time.