Landing boards on a fence do nothing to help keep the birds home, and chances are that the birds will still pace the fence anyway. They get panicked and a sudden onset of tunnel vision sets in focused only on where they want to go (not how to get there) the second they come face to face with wire obstructing their way.
5(b). See 3. Eat them.
Don't get me wrong -- still glad I've got my fifteen, and will probably have many more before I'm done. But, I'm guessin' it that long, skinny neck that prohibits oxygen from reachin' their itsy-bitsy fear-driven brains.
My theory of controlled exposure to the elements and advanced diets held true, in that I recovered the chick that got lose twenty hours after, following a damp night in the thirties. But, the guinea that got lose some time back? Didn't hesitate to wander entirely too far, and most probably fell victim to predation that very night ... still entirely my fault, for lettin' it get lose, and perhaps it just wasn't so fortunate as the chick, as it's tail feathers were somewhat tattered when I caught it. But, I suspect the guinea simply didn't learn/adapt as quickly as the chick did.