Conventional rigging and W-Mapping are actually doing the same thing.
They tell a vertex to move from position 1 to position 2.
The rigging, conventional or W-Mapping, has to tell that to a lot of points at the same time using a fall off zone..

For elbow and knee bends a "change" to the curve is sometimes required. 

Some creators do that by "painting" on the W-Map. I do..
Some do it by adding magnets.

Poser legacy figures do that by adding magnets.

Unfortunately for us, there are lots of left-right errors in those magnets in ALL Poser figures including the lastest ones.

These 'WRONG" and asymmetrical magnets make it extremely difficult to make clothing for legacy Poser figures.

Poser 1, 2, 3, 4, 5, 7, P8 and PPro2010, P9 and PP2012, P10 and PP2014 Game Dev
"Do not drive faster then your angel can fly"!